LLM Group 5 Criminal Law and Criminal Administration Forensic Science and Scientific Investigation of Crime 2015 Question Paper with Solutions

a) Narco-analysis (about 12.5 marks)

What it is. Narco-analysis is the interrogation of a subject brought by a slow intravenous infusion of a barbiturate, ordinarily sodium pentothal, into the hypnotic stage between consciousness and surgical anaesthesia. Barbiturates depress the central nervous system in a descending order, suppressing the higher cortical functions that govern deliberation before those that govern respiration, so there is a window in which the subject can speak but has reduced capacity to construct a deliberate account. The dose is titrated against his responses by an anaesthetist, with a psychologist conducting the interview, a forensic expert recording and the whole session on audio and video. The popular name "truth serum" is a misnomer, and identifying it as one is worth a mark, because no drug compels truth.

And what survives is discovery: material subsequently discovered with the help of a voluntary test may be proved under s.27 of the Evidence Act, now the proviso to s.23(2) of the Bharatiya Sakshya Adhiniyam, 2023. The Court directed strict compliance with the National Human Rights Commission's Guidelines for the Administration of Polygraph Test (Lie Detector Test) on an Accused, 2000, which require the option rather than a requirement, information about the implications with access to a lawyer, consent recorded before a Judicial Magistrate, and conduct in an independent agency in a lawyer's presence.

Before Selvi the technique was permitted, and in this State the leading decision was Ramchandra Ram Reddy v. State of Maharashtra, decided by the Bombay High Court on 5 March 2004, upholding orders of the Special Court at Pune permitting brain mapping, polygraph and narco-analysis of the accused in the counterfeit stamp paper investigation in which Abdul Karim Telgi was the principal accused. Amlesh Kumar v. State of Bihar, 2025 INSC 810, decided on 10 June 2025, is the current statement: it set aside a Patna High Court order of 9 November 2023 permitting involuntary testing, and held that an accused has no indefeasible right to demand the test and that its findings cannot be the sole basis of a conviction.

Three variants matter. Autosomal STR profiling is standard and most discriminating. Y-STR profiling finds a male contributor in a female-dominated mixture but identifies a paternal lineage, so all males in that line share it. Mitochondrial DNA survives degradation and is used on old bone, teeth and hair shafts, but identifies a maternal lineage.

The Indian legal position, which is where the marks are. There is no DNA statute in India. The DNA Technology (Use and Application) Regulation Bill, 2019, which would have created a DNA Regulatory Board, a national data bank and compulsory accreditation of laboratories, was introduced on 8 July 2019 and withdrawn from the Lok Sabha in July 2023.

In paternity disputes the position is separate. Section 116 of the Sakshya Adhiniyam, reproducing s.112 of the Evidence Act, makes birth during a valid marriage conclusive proof of legitimacy, rebuttable only by non-access. Goutam Kundu v. State of West Bengal, (1993) 3 SCC 418 held that courts cannot order a blood test as a matter of course, that a roving enquiry is not permitted, that a strong prima facie case of non-access must be shown, that the consequences of branding a child illegitimate must be weighed, and that no one can be compelled to give a sample. Nandlal Wasudeo Badwaik v. Lata Nandlal Badwaik, (2014) 2 SCC 576 is the counterweight: where the Central Forensic Science Laboratory at Hyderabad excluded the appellant as the biological father, the Supreme Court held that where there is a conflict between a conclusive proof envisaged by law and proof based on scientific advancement accepted by the world community, the latter must prevail.

Recovery, by archaeological method, recording the position of every element in three dimensions with the soil stratigraphy and associated objects, because that record establishes whether a grave was dug, whether the body was moved, how many individuals are present and roughly how long they lay there. Section 176(3) of the Sanhita now requires a forensic expert to attend the scene of every offence punishable with seven years or more, which is the provision that makes proper recovery a duty.

Preliminary assessment: is the material bone, is it human rather than animal, how many individuals are represented, and is it of forensic or archaeological antiquity.

The four determinations. Sex from the pelvis, which in the female is broader with a wide sub-pubic angle, a broad sciatic notch and a preauricular sulcus, and secondarily from the skull; accuracy is high from a complete pelvis and poor from long bones alone. Age from dental eruption in childhood, from epiphyseal fusion through adolescence into the mid twenties, and thereafter from the pubic symphyseal face, the sternal rib ends and cranial suture closure, each less precise than the last. Stature by regression from the maximum length of a long bone, the femur giving the best result, with a standard error of several centimetres that must be stated. Ancestry from craniofacial morphology, the weakest of the four.

Conclusion. Narco-analysis is interrogation under a barbiturate infusion, unreliable because suggestibility and confabulation are properties of the induced state, and after Selvi and Amlesh Kumar it cannot be compelled, its results are inadmissible even on consent, and only a discovery survives under the proviso to s.23(2) of the Sakshya Adhiniyam.

DNA profiling counts short tandem repeats and reports a random match probability, enters Indian trials as ordinary opinion evidence under s.39 by which Pattu Rajan holds the court is not bound, rests on ss.51, 52 and 184 of the Sanhita and the Criminal Procedure (Identification) Act, 2022 because there is no DNA statute after the 2019 Bill was withdrawn in July 2023, and is defeated by custody rather than by chemistry, as Rahul and Kattavellai show. Forensic anthropology identifies the unknown dead through archaeological recovery, the four determinations of sex, age, stature and ancestry, and individuation against ante-mortem records or by superimposition, with its most regulated Indian use, age determination, subordinated by s.94 of the Juvenile Justice Act to documentary proof.

What drunken driving is, in law

Section 185 of the Motor Vehicles Act, 1988 defines the offence, and it has two limbs. A person is guilty who, while driving or attempting to drive a motor vehicle, has in his blood alcohol exceeding thirty milligrams per one hundred millilitres of blood, detected in a test by a breath analyser or in any other test including a laboratory test; or who is under the influence of a drug to such an extent as to be incapable of exercising proper control over the vehicle.

Three features of that definition should be drawn out. First, the offence in the first limb is committed by exceeding a number, not by being visibly drunk; a person who is unimpaired but over thirty milligrams commits it. Second, the statute requires a test: a police officer's impression of a smell of liquor, unsupported by a breath analyser or a laboratory test, does not by itself establish the first limb, and prosecutions have failed on exactly that. Third, the drug limb is different in kind, because it has no threshold and requires proof of incapacity to control the vehicle, which is why drug-impaired driving is very much harder to prosecute in India than alcohol-impaired driving.

Reaction time lengthens, so the distance travelled between perceiving a hazard and beginning to brake increases, and at highway speed a fraction of a second is many metres.

Vision degrades in specific ways: peripheral vision narrows, which is why an intoxicated driver misses a vehicle entering from the side; night vision and recovery from oncoming headlight glare are impaired; and eye movements become slower and less accurate, producing the horizontal gaze nystagmus that field testing looks for.

Judgment and risk assessment are affected in the opposite direction from performance: the driver becomes more confident as he becomes less able, which is the single most dangerous feature of the drug and the reason self-assessment is worthless.

Motor control and tracking deteriorate, producing weaving within the lane, and at higher concentrations there is drowsiness, and beyond that stupor.

Section 106(2) is the provision worth knowing precisely, because it is where most answers go wrong. It provides that whoever causes death by rash and negligent driving of a vehicle not amounting to culpable homicide and escapes without reporting it to a police officer or a Magistrate soon after the incident shall be punished with imprisonment up to ten years and fine. That sub-section has not been brought into force. Its commencement was deferred after the nationwide transporters' protest of January 2024, and the Union Home Ministry gave an assurance that it would not be implemented without consultation with the road transport industry. So although the Bharatiya Nyaya Sanhita came into force on 1 July 2024, s.106(2) did not, and an answer that states the ten-year hit-and-run punishment as current law is wrong.

Where the driver knew that his act was so imminently dangerous that it must in all probability cause death, the charge may rise to culpable homicide, and the courts have upheld such charges where a driver drove while grossly intoxicated in a crowded place. Beyond the criminal law there is disqualification from holding a licence, and the very serious civil consequence that an insurer may repudiate liability under the policy where the driver was under the influence of intoxicating liquor, which shifts the loss from the insurer to the driver and often leaves the victim's family pursuing a man without assets.

Its weaknesses must be given because they are the standard defences. The partition ratio varies between individuals and within the same individual, so the conversion is an approximation. Residual mouth alcohol, from a recent drink, from regurgitation or reflux, or from a mouth spray, produces a falsely high reading, which is why a waiting period before the test is part of correct procedure. Semiconductor sensors respond to acetone, which is elevated in uncontrolled diabetes and in ketosis. And the reading is taken at the time of the test and not at the time of driving, so absorption or elimination in the interval must be accounted for.

Methods of detection: the laboratory

Blood alcohol by headspace gas chromatography is the reference method and the gold standard. A sealed vial of blood is warmed, the vapour above the sample is drawn off and injected into a gas chromatograph, and the ethanol is separated and quantified against internal standards, usually with a flame ionisation detector and often confirmed on a second column of different chemistry. The sample must be drawn with a non-alcoholic swab and collected into a tube containing sodium fluoride as a preservative and potassium oxalate as an anticoagulant, because without fluoride any microbial contamination will ferment the glucose in the sample and generate ethanol after collection, producing a falsely high result. That single point is worth a mark and is the toxicological counterpart of the rule in post-mortem work that decomposition itself produces ethanol.

The leading Indian decision, and one from this State, is Alister Anthony Pareira v. State of Maharashtra, (2012) 2 SCC 648, decided on 12 January 2012. In the early hours of 12 November 2006 a car driven by the appellant mounted the pavement on Carter Road at Bandra West in Mumbai, killing seven people who were sleeping there and injuring eight others, the appellant having been drinking. The question was whether that was rash and negligent driving simply, or culpable homicide not amounting to murder.

The Supreme Court upheld the conviction under the culpable homicide provision and laid down the test that matters: rash or negligent driving on a public road with knowledge of the dangerous character and the likely effect of the act, resulting in death, may fall within culpable homicide not amounting to murder. The Court also held that where an allegation is made that an accident was caused by drunkenness, the investigating agency is bound to register the case accordingly rather than treating it as ordinary negligence.

The second line concerns sentencing, and it exists because trial courts had for years imposed nominal sentences in fatal traffic cases and the Supreme Court has repeatedly said that they should not. In State of Punjab v. Saurabh Bakshi, (2015) 5 SCC 182, decided on 30 March 2015, an Indica car driven by the respondent collided head on with a Maruti car near Village Mehmadpur in June 2007 and both occupants of the other car died; the trial Magistrate imposed one year's rigorous imprisonment and a fine of two thousand rupees, and the High Court reduced even that on the footing that compensation had been paid. The Supreme Court restored the sentence, observed that India has a disreputable record of road accidents and that there is a nonchalant attitude among Indian drivers, and said in terms that the lawmakers should scrutinise, relook at and revisit the sentencing policy for causing death by negligence, which at that time carried a maximum of two years.

The forensic point to draw from both lines is that the whole of this jurisprudence rests on a laboratory result. Knowledge is inferred from the fact and degree of intoxication, and the degree of intoxication is a number produced by a breath analyser at the roadside or by headspace gas chromatography of a blood sample drawn with a non-alcoholic swab into a fluoride tube. Where that number was never obtained, or was obtained without the preservative, the graver charge is very difficult to sustain, and the case falls back to ordinary negligence.

Conclusion. Drunken driving is defined by s.185 of the Motor Vehicles Act, 1988 as driving or attempting to drive with alcohol exceeding thirty milligrams per hundred millilitres of blood, detected by a breath analyser or any other test including a laboratory test, or under the influence of a drug to the extent of being incapable of exercising proper control, with penalties raised by the 2019 amendment to six months or ten thousand rupees for a first offence and two years or fifteen thousand rupees for a subsequent one within three years.

For full marks, cover: the stem prints "modern devices or crime control", an obvious slip for "of", and it should be read that way; say so in a clause and move on. Then organise the answer around the three things crime control actually requires, deterrence, detection and proof, because a device that is excellent at one is often useless at another, and an answer arranged that way will read as analysis rather than as a catalogue. Cover a wide spread with a sentence of use each, take three or four far enough to attach a statute and a case, and reserve the last five marks for the constitutional cost.

A note on the question as printed. The English stem reads "Discuss in detail about modern devices or crime control", which is a misprint for "of crime control", and the answer is written on that reading. The second paper in this scan asks the same question at Q11 in correct English.

Devices of deterrence

Closed circuit television, where visible, raises the perceived risk of detection and is classical situational crime prevention. Metal detectors and baggage X-ray scanners and portable explosive trace detectors prevent by exclusion, keeping a weapon or a device out of a protected space rather than detecting an offence. Radar and laser speed guns and red light violation detection systems deter at a scale discretionary policing cannot achieve, because they remove the possibility of negotiation at the roadside. Lighting, alarms, access control and the design of the built environment belong here too, are the cheapest of all, and are almost always omitted from answers.

Their use is now partly compulsory. Section 176(3) of the Bharatiya Nagarik Suraksha Sanhita, 2023 requires that, on information of an offence punishable with seven years or more, the officer in charge of the police station shall, from such date as may be notified within a period of five years by the State Government, cause a forensic expert to visit the scene to collect forensic evidence and cause videography of the process; where the facility does not exist in the State, the State must notify the use of another State's. Sections 105 and 185 require the search and seizure process and the list of seized articles to be recorded by audio-video electronic means and forwarded to the Magistrate.

The thermal cycler and capillary genetic analyser perform DNA profiling. The comparison microscope performs firearm and tool-mark comparison, and Sukhwant Singh v. State of Punjab, (1995) 3 SCC 367 holds that where both the weapon and the crime cartridge are recovered, failing to obtain the ballistic opinion affects the creditworthiness of the prosecution case to a great extent. The video spectral comparator and the electrostatic detection apparatus perform questioned document work. The scanning electron microscope with energy dispersive X-ray analysis identifies gunshot residue particles of lead, barium and antimony.

Their reports reach a court under s.329 of the Sanhita, the Director of a Central or State Forensic Science Laboratory, the Chemical Examiner, the Chief Controller of Explosives, the Director of the Finger Print Bureau and the Serologist all being Government scientific experts, and the second proviso to s.330 relieves the expert of attendance unless a party disputes the report.

Devices of proof, and why so many fail there

A device produces proof only if the law admits its output, and for everything electronic the gate is s.63 of the Bharatiya Sakshya Adhiniyam, 2023. Computer output is admissible on the conditions in sub-section (2), and sub-section (4) requires a certificate identifying the record, describing the manner of its production and giving the particulars of the device, submitted at each instance where the record is submitted for admission.

Arjun Panditrao Khotkar v. Kailash Kushanrao Gorantyal, (2020) 7 SCC 1, decided on 14 July 2020 on the corresponding s.65B of the Evidence Act, held that certificate mandatory, affirmed Anvar P.V. v. P.K. Basheer, (2014) 10 SCC 473 and overruled Shafhi Mohammad, while allowing that no certificate is needed where the original device is produced and its holder testifies. Section 39(2) of the Adhiniyam makes the Examiner of Electronic Evidence an expert, and s.193(3)(i) of the Sanhita requires the police report to state the sequence of custody in the case of an electronic device.

The cost

Under s.4(2) of the Criminal Procedure (Identification) Act, 2022, records of measurements are retained for seventy-five years from collection, with destruction available only to a person not previously convicted who is released without trial, discharged or acquitted after exhausting all remedies, and even then subject to the court directing otherwise. Measured against K.S. Puttaswamy v. Union of India, (2017) 10 SCC 1, which requires legality, a legitimate State aim and proportionality for any invasion of privacy, that is difficult to defend and has not been authoritatively tested. The Digital Personal Data Protection Act, 2023 supplies no check, exempting processing for the prevention, detection, investigation or prosecution of an offence by s.17(1)(c) and notified State instrumentalities by s.17(2)(a).

There is also an accuracy cost, and the Indian warning is Mohd. Aman v. State of Rajasthan, (1997) 10 SCC 44, where a conviction on a chance fingerprint developed on a brass jug was set aside because the specimen prints had been taken three times without the Magistrate's order the law then required and the jug had been in police custody along with the accused, so fabrication could not be excluded.

For full marks, cover: a bare "discuss and elaborate" stem gives you the choice of structure, and the most natural one for ballistics is to follow the cartridge itself, from the moment the firing pin strikes to the moment the projectile stops inside a body, saying at each stage what evidence is created and what an examiner can read from it. That structure covers the three divisions of the science without listing them mechanically, produces the case law in its proper place, and cannot be confused with the other two ballistics answers on this scan, at Q8 and Q10.

Stage one: the strike, and what the primer records

A cartridge consists of a case, a primer seated in its head, a propellant charge and a projectile. When the trigger is released, the firing pin strikes the primer cup and indents it. That indentation is the first item of evidence, and it is individual: the tip of every firing pin carries microscopic irregularities from manufacture and use, and it reproduces them on every primer it strikes. A recovered cartridge case therefore carries a firing pin impression which can be compared against a test firing.

Stage three: the bore, and what the bullet records

The projectile, slightly larger than the bore, is forced through the barrel. A rifled barrel carries helical grooves cut into it to spin the projectile and stabilise its flight, the raised surfaces between them being the lands, and these engrave the bullet.

What is engraved is of two kinds and the distinction is the most important one in the topic. Class characteristics are shared by every weapon of that make and model: the calibre, the number of lands and grooves, their widths, and the direction and rate of twist. They identify a class of weapon and, decisively, exclude with certainty every weapon outside it, and no expert judgment is involved in saying so. Individual characteristics are the microscopic longitudinal striations produced by the imperfections the cutting tools left in that particular barrel and added by wear, fouling and corrosion, and they are the basis of any claim that this weapon fired this bullet.

A smoothbore barrel has no rifling and imparts no striations to the shot at all. Since country-made and smoothbore weapons dominate the Indian firearm docket, this is not an academic exception: in a very large proportion of Indian firearm cases the projectile carries nothing to compare and the examiner is confined to the cartridge case and the wads.

Its limits are severe and belong here: it is lost within hours by washing, wiping and ordinary activity; it transfers from a police vehicle, from handcuffs and from an officer who has himself fired; and it settles on bystanders. It establishes proximity to a discharge and not the act of firing.

Stage five: the flight

External ballistics governs what happens between the muzzle and the target: the trajectory, the loss of velocity to air resistance, the gyroscopic stability produced by the spin, and drift and drop over distance. For most Indian shootings, which occur at short range, the trajectory is near enough to a straight line to allow reconstruction from the entry point, any intermediate perforation of a door, windscreen or wall, and the resting place of the projectile, using rods, string or a laser kit. Combined with the distribution of ejected cartridge cases, which a self-loading weapon throws in a characteristic direction and distance, that establishes where the firer stood.

Stage six: the impact, and what the wound records

Terminal ballistics governs the impact, and its medical branch, wound ballistics, governs the injury. Two determinations matter.

The distinction between blackening, which is surface soot and wipes off, and tattooing, which consists of individual abrasions and does not, is the classic examination point and is a real forensic one, because tattooing survives washing. Where the clothing is dark or bloodstained the residue is invisible and infrared photography recovers it.

The Indian authorities

Mohinder Singh v. State, AIR 1953 SC 415, decided on 17 October 1950, where the question was whether the wounds were caused by a gun or a rifle, held that where death is due to injuries caused by a lethal weapon it has always been the duty of the prosecution to prove by expert evidence that it was likely, or at least possible, for the injuries to have been caused with the weapon alleged and in the manner alleged.

Sukhwant Singh v. State of Punjab, (1995) 3 SCC 367 held that where injuries are caused by a firearm and both the weapon and the crime cartridge are recovered, the ballistic expert's opinion is of considerable importance in connecting the accused with the crime, and its non-production affects the creditworthiness of the prosecution case to a great extent; there an empty cartridge case had been recovered from the scene and a pistol seized from the appellant on arrest, and neither was sent for comparison.

Pritinder Singh @ Lovely v. State of Punjab, 2023 INSC 614, decided on 5 July 2023, acquitted where the ballistic expert had not been examined to show that the recovered wad and pellets had been fired from the empty cartridges found, calling the omission a glaring defect.

Conclusion. Following a cartridge from the strike of the firing pin to the wound shows where each item of ballistic evidence comes from and what it is worth. The primer records the firing pin; the pressure records the breech face, and in a self-loading weapon the extractor and ejector, so the cartridge case is often the better exhibit and carries the head-stamp besides. The bore engraves the bullet with class characteristics of calibre, land and groove count and twist, which exclude with certainty, and with individual striations, which support an identification as a judgment. The muzzle deposits propellant residue forward, which gives range, and primer residue rearward, which gives at best proximity to a discharge and is identified as lead, barium and antimony by scanning electron microscopy.

For full marks, cover: the descriptive form of the question, so give the machinery accurately: what the organisation is, how it is constituted, the four functions, the eight notices, India's place in it, and the criticism. The second paper in this scan sets the topic at Q13 as "Functions and role of Interpol in curbing International Crimes", which shifts the weight to the operational work. Open by disposing of the misconception that INTERPOL is a police force; that single sentence protects the rest of the answer.

What the organisation is

The International Criminal Police Organization has 196 member countries and its headquarters at Lyon in France. It was founded at Vienna in 1923 as the International Criminal Police Commission, was captured and discredited during the Second World War, was reconstituted in 1946 with its seat at Paris, and took its present name and Constitution in 1956. India joined on 15 October 1949 and was not a founding member.

The constitutional structure

The General Assembly, in which every member country is represented by its delegates, is the supreme governing body; it meets annually, determines policy, approves the budget and programme and elects the President and the Executive Committee.

The Executive Committee, headed by the President, supervises the execution of the Assembly's decisions and oversees the work of the Secretary General between sessions.

The General Secretariat at Lyon, headed by the Secretary General, is the permanent administration, operating continuously, with regional bureaus and a Global Complex for Innovation at Singapore devoted to cybercrime, research and capability development.

The National Central Bureau is the piece that makes the whole thing work. Each member country designates a unit within its own police structure as the single point of contact for all INTERPOL business, staffed by its own officers and operating under its own law. In India the National Central Bureau is the Central Bureau of Investigation, known as NCB-New Delhi.

Operational data services and databases. The organisation maintains databases on wanted persons; on stolen and lost travel documents, which by volume is its most consulted product and is queried at borders worldwide; on stolen motor vehicles; on stolen works of art; on fingerprints and DNA profiles; on firearms and firearm traces; on child sexual abuse material; and on maritime piracy. The qualification that distinguishes a good answer is that INTERPOL contributes nothing to these databases itself: every record was supplied by a member, so their coverage is as uneven as members' willingness to share.

Operational police support. Specialist units address counter-terrorism, organised and emerging crime, cybercrime, financial crime and corruption, fugitive investigation, trafficking in human beings and migrant smuggling, environmental and wildlife crime, and illicit and counterfeit goods. Incident Response Teams deploy at a member's request after a major crime or disaster, and the Disaster Victim Identification guide is the internationally accepted standard for mass fatality identification, resting on three primary identifiers, fingerprints, dental records and DNA, with secondary identifiers such as medical findings, tattoos and personal effects in support.

A diffusion is distinct: it is circulated directly by one National Central Bureau to others of its choosing, rather than published by the General Secretariat, and receives less prior scrutiny.

India, and the ceiling on the Red Notice

Bhavesh Jayanti Lakhani v. State of Maharashtra, (2009) 9 SCC 551 fixes the Indian position. The appellant was alleged to have removed a child in breach of foreign custody orders; warrants had issued abroad and a Red Corner Notice had been published; and the Maharashtra police proceeded as though the notice authorised them to act against him.

The criticism

Article 3 cannot be enforced against a determined State, because the organisation must assess political motivation on the material the requesting State supplies, and a State pursuing an opponent presents the case as ordinary crime. Notices and diffusions have been used against dissidents, journalists and refugees, and the reforms of the last decade, a task force reviewing requests before publication and a Commission for the Control of Files empowered to order deletion, reduce the abuse without curing its cause.

Consequences precede adjudication. A person subject to a Red Notice may be detained at borders, refused visas and excluded from banking before any court has examined the merits, and his only direct remedy is to an internal Commission and not to a court.

Everything depends on members. The databases contain what States choose to contribute, cooperation in a given case is voluntary, and where a State declines to act INTERPOL has no remedy at all.

The practical consequence is severe and is worth stating, because it explains why extradition requests are drafted with such care. A State that secures a fugitive on a narrow request cannot afterwards widen the trial, however strong the additional material against him, so an investigating agency that has not assembled its whole case before the request is made will find that the surrender it fought for has fenced in its own prosecution.

The second decision concerns the assurances on which a surrender is obtained. In Abu Salem Abdul Kayyum Ansari v. State of Maharashtra, 2022 INSC 671, the appellant had been extradited from Portugal in 2005 after the Government of India gave the Portuguese authorities a solemn assurance that he would not be sentenced to death and would not be imprisoned for a term exceeding twenty-five years, an assurance required because Portuguese law forbids surrender in the absence of it. He was subsequently convicted and sentenced in India, and the question was whether the courts were bound by the executive's promise. The Supreme Court held that the judiciary is bound to honour the sovereign assurance given by the executive, so his imprisonment could not extend beyond twenty-five years, and that the period spent in custody in Portugal before extradition was to be set off.

Its four functions are the secure I-24/7 network, the member-supplied operational databases, operational support including Incident Response Teams and the Disaster Victim Identification standard, and capability building, exercised publicly through the eight notices. India joined on 15 October 1949 and its National Central Bureau is the Central Bureau of Investigation, and Bhavesh Jayanti Lakhani establishes that a Red Corner Notice is not a warrant, authorises no arrest, and takes legal effect in India only through the Extradition Act, 1962.

Period one: the antecedents, before 1849

The idea that a physical trace can prove a fact about a crime is present in Indian sources long before any institution existed to act on it. Kautilya's Arthashastra, of about the fourth century before the common era, deals with the investigation of sudden death, the examination of the body and the detection of poisoning, and treats the interrogation and the physical examination as parts of one enquiry. What the ancient material could not do was produce a result that a tribunal could test, which is precisely what the institutions of the nineteenth century supplied.

Period two: the chemical beginning, 1849 to 1890

Indian forensic science begins with poison, and the reason is administrative rather than scientific. Poisoning was the offence the colonial administration found hardest to prove and easiest to fear, so the first institutions built were chemical.

William Herschel, a magistrate at Jungipoor in Bengal, began taking finger impressions on contracts in 1858, initially to prevent repudiation, and over the following decades satisfied himself that the patterns did not change with age. That is the first empirical demonstration of permanence anywhere, and it was done in India on Indian records.

Meanwhile the competing system arrived. Alphonse Bertillon's anthropometry, introduced at Paris in 1879, took eleven body measurements which in combination were supposed to identify an individual, and an Anthropometric Bureau was established at Calcutta in 1892, the first of its kind in India. It failed, in India as everywhere, because the measurements were not reproducible between operators, a failure demonstrated conclusively in 1903 when two unrelated prisoners at Leavenworth, both named West, proved to have effectively identical measurements.

The office of the Government Examiner of Questioned Documents was established at Shimla in 1906, the first document examination unit in the country, and was followed by Kolkata in 1964 and Hyderabad in 1968. A Serology Department was established at Calcutta in 1910, following the discovery of the ABO groups by Landsteiner and of the precipitin test by Uhlenhuth, both in 1901, which for the first time allowed a stain to be shown to be human blood. A footprint section and a note forgery section were created in the Bengal Criminal Investigation Department in the following decade.

The shape of the colonial inheritance is therefore: chemistry first, identification second and led by India, documents third, biology fourth. That is the order in which offences were hard to prove by testimony, and it is worth saying so.

Period five: building the network, 1947 to 2000

After independence the task was to convert a handful of Presidency institutions into a national network.

DNA arrived in India unusually early. The Centre for Cellular and Molecular Biology at Hyderabad, under Dr Lalji Singh, developed an indigenous probe in 1988, four years after Alec Jeffreys' discovery at Leicester, making India the third country in the world to develop its own DNA fingerprinting probe. Its first judicial acceptance was in Kunhiraman v. Manoj, II (1991) DMC 499, a Kerala maintenance claim brought in 1988 by a woman of Tellicherry, in which profiling at the Centre established paternity; the High Court held that DNA evidence was admissible as expert opinion in the same way as ballistic and fingerprint opinion and could by itself decide a paternity dispute.

Period six: the legislative phase, 2020 to 2025

The most recent Indian development is legislative rather than scientific, and it is where the answer should end.

The National Forensic Sciences University Act, 2020 merged the Gujarat Forensic Sciences University at Gandhinagar and the Lok Nayak Jayaprakash Narayan National Institute of Criminology and Forensic Science at Rohini, Delhi, into a single university with the status of an Institution of National Importance.

The counterpoint belongs in the same paragraph. The DNA Technology (Use and Application) Regulation Bill, 2019, which would have created a DNA Regulatory Board with power to accredit laboratories and lay down standards, was withdrawn from the Lok Sabha in July 2023, so India has no statute regulating the accreditation or standards of its forensic laboratories at all.

The consequence is that the Supreme Court has had to supply the standards itself: in Kattavellai @ Devakar v. State of Tamil Nadu, 2025 INSC 845, decided on 15 July 2025, samples taken on 19 May 2011 had reached the laboratory only on 29 June 2011, and the Court, acquitting a man under sentence of death, directed for the whole country documented packaging bearing the FIR number and date, the section and statute, the investigating officer and police station details and a serial number, delivery within forty-eight hours with written reasons for any delay, and a Chain of Custody Register signed by every handler and forming part of the trial record. That followed Rahul v. State of Delhi (NCT of Delhi), 2022 LiveLaw (SC) 926, where samples had lain in police custody for about two months and three death sentences were set aside.

Documents and serology followed at Shimla in 1906 and Calcutta in 1910. The post-independence period built the national network now under the Directorate of Forensic Science Services, with seven Central Forensic Science Laboratories, and saw India develop its own DNA probe at Hyderabad in 1988 and accept the technique in Kunhiraman v. Manoj in 1991. And the current phase is legislative, from the National Forensic Sciences University Act, 2020 and the Criminal Procedure (Identification) Act, 2022 to the two codes of 1 July 2024, with the defining imbalance that the power to collect has been enlarged while the regulation of the laboratories has not, the DNA Bill having been withdrawn in July 2023 and the standards having been supplied by the Supreme Court in Kattavellai instead.

a) Use of forensic science in ascertaining the age of a person (about 12.5 marks)

Why age matters, which must come first. Age changes the legal character of everything around it. Under the Bharatiya Nyaya Sanhita, 2023, s.20 provides that nothing is an offence which is done by a child under seven years of age, and s.21 that nothing is an offence done by a child above seven and under twelve who has not attained sufficient maturity of understanding to judge of the nature and consequences of his conduct on that occasion. Under the Juvenile Justice (Care and Protection of Children) Act, 2015 a person under eighteen is a child and is dealt with by a Board rather than tried by a court. In sexual offences age determines whether consent can be given at all and whether the Protection of Children from Sexual Offences Act, 2012 applies. Age also governs marriage, employment, and, in civil matters, capacity and succession.

The medical methods, by life stage. Dentition is the most reliable indicator in childhood: the deciduous teeth erupt on a known timetable in the first two to three years and the permanent teeth on another through childhood and adolescence, the third molar erupting between about seventeen and twenty-five with wide variation, and dental age is assessed radiographically as well as by inspection.

Epiphyseal fusion governs adolescence into the mid twenties: the growing ends of the long bones are separated from the shafts by cartilaginous plates which ossify and fuse in a known order, the elbow relatively early, the wrist and hip in the later teens, and the medial end of the clavicle latest of all at about twenty-two to twenty-five, assessed on radiographs of the wrist, elbow, shoulder, hip and knee against standard atlases. Degenerative markers take over afterwards and are progressively less precise: the pubic symphyseal face, the sternal ends of the ribs, cranial suture closure, and dental attrition. Beyond about twenty-five, medical age determination is an estimate within a band of years rather than a determination.

b) Forensic science laboratories (about 12.5 marks)

What a forensic laboratory is for. It is a public scientific institution whose entire output is prepared to be used in litigation, and that fact rather than its instruments is what distinguishes it. A research laboratory may correct a provisional result; a hospital laboratory may repeat a test; a forensic laboratory produces a document used to deprive a person of liberty, concerning a sample that frequently cannot be replaced. Everything characteristic follows: the exhibit arrives sealed and the seal is described, every movement is recorded, the quantity consumed is noted and the remainder preserved for a second opinion, and the report states the method and not merely the conclusion.

The Indian network. At the central level the laboratories sit under the Directorate of Forensic Science Services, an attached office of the Ministry of Home Affairs, with seven Central Forensic Science Laboratories: Kolkata, the oldest and a centre of excellence in the biological sciences; Hyderabad, in the chemical sciences; Chandigarh, in the physical sciences; New Delhi, under the administrative control of the Central Bureau of Investigation; and Guwahati, Bhopal and Pune, established as Central Forensic Institutes in 2011 and notified as laboratories in 2013.

How the work reaches a court. Opinion is relevant under s.39(1) of the Bharatiya Sakshya Adhiniyam, 2023, with s.39(2) adding the Examiner of Electronic Evidence and s.45 making the grounds relevant. Under s.329 of the Bharatiya Nagarik Suraksha Sanhita, 2023 a report of a Government scientific expert, including the Director, Deputy Director or Assistant Director of a Central or State Forensic Science Laboratory under sub-section (4)(e), may be used as evidence; the second proviso to s.330 relieves the expert of attendance unless a party disputes the report; and s.336 requires the successor in the post to depose where the analyst has been transferred, retired or died.

The change of role. Section 176(3) of the Sanhita now requires a forensic expert to visit the scene of every offence punishable with seven years or more, from a date the State notifies within five years, with videography, which converts the laboratory from an institution that receives exhibits into an agency that collects them.

Handwriting comparison. The premise is that writing is a semi-automatic motor habit, individual to the writer and neither fully suppressible nor fully imitable. The examiner separates class characteristics, reflecting the copybook system taught and capable only of excluding, from individual characteristics, which identify: line quality, the smoothness and rhythm of the stroke, which is the most informative single feature; pen pressure and its patterned variation; pen lifts and hesitations; the manner of beginning and ending strokes; connecting strokes; letter proportions; slant; spacing; alignment; and the design of particular letters.

Standards decide the case. They must be adequate in number, contemporaneous, and comparable, a signature being compared with signatures and not with running hand. Collected standards, written before the dispute arose, cannot have been distorted for the purpose; requested standards, taken to dictation, let the examiner control the instrument, surface and text but are open to disguise, which is why they are taken repeatedly and at intervals. They are compellable under s.349 of the Sanhita, and that compulsion does not offend Article 20(3) because State of Bombay v. Kathi Kalu Oghad, AIR 1961 SC 1808 held that furnishing a specimen is a mechanical act supplying material and not personal testimony.

The law and the weight. Section 39(1) of the Sakshya Adhiniyam makes expert opinion on the identity of handwriting relevant; s.41 makes relevant the opinion of a person acquainted with another's handwriting; s.45 makes the grounds relevant; and s.72 permits the Court itself to compare a disputed signature, writing or seal with one admitted or proved, on which State (Delhi Administration) v. Pali Ram, (1979) 2 SCC 158 held that prudence requires a judge to hesitate before basing on his own comparison alone a finding about a handwriting which is the sheet anchor of the prosecution case, and that the prudent course is to obtain expert assistance.

On weight the Supreme Court has said two different things. Magan Bihari Lal v. State of Punjab, (1977) 2 SCC 210 held that expert opinion must be received with great caution, that it is unsafe to convict solely upon it without substantial corroboration, and that this had almost become a rule of law. Murari Lal v. State of Madhya Pradesh, (1980) 1 SCC 704 held that there is no rule of law, nor any rule of prudence crystallised into a rule of law, that such opinion must never be acted on unless substantially corroborated; the approach must be one of caution, the reasons must be probed, and where they are convincing the uncorroborated testimony may be accepted. Giving both, and saying they are not easy to reconcile, is worth more than giving either.

Forensic science laboratories are public institutions whose output is prepared for litigation, organised in India as seven Central Forensic Science Laboratories under the Directorate of Forensic Science Services, three offices of the Government Examiner of Questioned Documents, the Central Finger Print Bureau and a State laboratory in every State, whose reports enter evidence under ss.329, 330 and 336 of the Sanhita and whose role has been enlarged by s.176(3) faster than either their capacity or their regulation has grown. Questioned document examination establishes authorship and authenticity from line quality and the other individual characteristics of writing, compared against adequate contemporaneous standards obtainable under s.349, using the video spectral comparator, the electrostatic detection apparatus and the stereomicroscope, and its weight remains unsettled between Magan Bihari Lal and Murari Lal.

For full marks, cover: this paper sets ballistics twice, here and at Q10, and the first paper in the same scan sets it a third time at Q4. Where the same subject is set twice on one sheet, the examiner is not expecting the same answer twice; he is expecting you to choose an approach and carry it through. This answer is built on the anatomy of a ballistics report, section by section, which is the practitioner's view of the subject: what an examiner is actually asked, what he actually does, and what he can honestly write. That structure covers the whole science, produces the case law where it belongs, and reads as knowledge rather than as recall.

The examiner's brief

A ballistics examiner in a Central or State Forensic Science Laboratory receives a sealed parcel and a forwarding memorandum which asks, in one form or another, five questions. Is this article a firearm and is it in working order. Was this bullet or this cartridge case fired from this weapon. How many weapons were used. From what range was the shot fired. And is there residue connecting a named person to a discharge.

Section two: test firing

The examiner test-fires the weapon into a recovery medium, ordinarily a water tank or a cotton box, so that the test bullet is recovered undeformed and carries the barrel's marks unaltered. He also test-fires at measured distances onto material similar to the victim's clothing, to generate the reference residue patterns against which range will later be estimated.

This section records the ammunition used, because a comparison made with ammunition of a different make and load is open to attack.

Section three: examination of the bullet

Here the report separates two things, and the separation is the single most important idea in the topic.

Class characteristics: the calibre, the number of lands and grooves, their widths, and the direction and rate of twist impressed by the rifling. These identify a class of weapon and exclude with certainty every weapon outside that class. A bullet showing six lands and grooves with a right-hand twist did not come from a five-groove left-hand weapon, and no judgment is involved.

Section four: examination of the cartridge case

The case carries at least four independent sets of marks, and because it is not deformed on impact it is frequently the better exhibit: the firing pin impression on the primer cup; the breech face marks impressed on the head as gas pressure drives the case rearward; and, in a self-loading weapon, the extractor mark on the rim and the ejector mark where the case is thrown clear, with chamber marks on the body.

The head-stamp gives the calibre, the manufacturer and often the production lot, which can link ammunition recovered from a suspect to ammunition fired at a scene even where no weapon is available.

Grouping the recovered cases by their marks answers the third question in the brief, how many weapons were used, which frequently determines how many assailants there were and is central to any case of common intention.

Section five: range and direction

Range is estimated by comparing the residue pattern at the entry with the patterns produced by the test firings at measured distances.

Direction is settled by distinguishing entry from exit, which is the medical witness's finding but is interpreted with the ballistic evidence. The entry wound has inverted margins and an abrasion collar, a ring of grazed skin produced as the bullet indents and stretches the skin before perforating; the exit has everted margins, no abrasion collar and no soot or tattooing at any range. The exception is the shored exit wound, where the exiting skin is supported by a wall, floor or tight garment and abrades against it. In the skull the answer is unambiguous: a bullet entry shows internal bevelling and an exit external bevelling.

Where the clothing is dark or bloodstained the residue is invisible to the eye, and infrared photography is used, because soot and fabric differ in infrared reflectance even where they do not differ visibly.

Section seven: the opinion, and how it reaches a court

The report concludes with a reasoned opinion and, in good practice, charted photographic enlargements demonstrating the corresponding striations, because s.45 of the Bharatiya Sakshya Adhiniyam, 2023 makes the grounds of an opinion relevant and an opinion whose grounds are not shown is worth very little.

The opinion is relevant under s.39(1) of the Adhiniyam. The report reaches the court under s.329 of the Bharatiya Nagarik Suraksha Sanhita, 2023, the Director, Deputy Director or Assistant Director of a Central or State Forensic Science Laboratory being a Government scientific expert under sub-section (4)(e), so it may be used as evidence and the Court may summon the expert if it thinks fit; by the second proviso to s.330 he is not called unless a party disputes the report; and s.336 requires the successor in the post to depose where he has been transferred, retired or died.

What an honest report cannot say

The final section of any competent report is what it does not conclude, and it is the section that separates a professional examiner from an advocate. Striation comparison has no measured error rate and no numerical threshold, and the examiner ordinarily knows which weapon the investigation favours. Barrels change with use and corrosion. Smoothbore weapons leave nothing to compare. Primer residue proves proximity and not firing. And no ballistic finding, however strong, establishes who pulled the trigger; at its highest it establishes that a particular weapon fired a particular round.

For full marks, cover: the operative phrase is "helping criminal administration", which is broader than either investigation or trial: it takes in the police, the prosecution, the courts, the prison system and the policy machinery. Organise the answer by the institution the laboratory helps, and you will produce a structure no other candidate has. Give the Indian network accurately with its dates and locations, give the statutory provisions that carry its work, and then be honest about capacity and regulation, because the strongest answers to a question about importance are the ones that say where the importance is not yet matched by capability.

What a forensic laboratory contributes, in principle

A criminal justice system runs on three kinds of material: what people say, what documents record, and what physical objects carry. The first two are cheap to obtain and easy to corrupt; the third is expensive to obtain and hard to corrupt. A forensic science laboratory exists to make the third usable, by converting an object into an opinion that an investigator can act on, a prosecutor can lead and a court can test.

Questioned documents for the central agencies go to the three offices of the Government Examiner of Questioned Documents: Shimla, established in 1906 and the oldest document unit in the country, Kolkata from 1964 and Hyderabad from 1968. Fingerprint records are held by the Central Finger Print Bureau under the National Crime Records Bureau.

Every State runs a State Forensic Science Laboratory with regional and district laboratories and mobile units beneath it. In Maharashtra the Directorate of Forensic Science Laboratories at Kalina, Mumbai, with regional laboratories at Pune, Nagpur, Nashik, Aurangabad and elsewhere, is the pattern. Training and higher education were consolidated by the National Forensic Sciences University Act, 2020, which merged the Gujarat Forensic Sciences University at Gandhinagar and the Lok Nayak Jayaprakash Narayan National Institute of Criminology and Forensic Science at Rohini into an Institution of National Importance.

The prosecution. The laboratory supplies proof of elements that no witness can supply: that a substance is a narcotic drug and of what quantity, which determines the sentencing band under the Narcotic Drugs and Psychotropic Substances Act, 1985 and on which Hira Singh v. Union of India, (2020) 20 SCC 272 overruled E. Micheal Raj v. Intelligence Officer, NCB, (2008) 5 SCC 161 to hold that the whole weight of the mixture counts; that an article is a firearm in working order, which ss.25 and 27 of the Arms Act, 1959 require; that a stain is human blood; that a death was caused by a particular poison.

The defence and the innocent. The laboratory's exclusionary capacity is a help to criminal administration and not a hindrance to it. DNA excludes far more often than it identifies, and a system that convicted on confession and eyewitness recognition alone would convict more of the innocent.

Policy and record-keeping. Through the National Crime Records Bureau, the Crime and Criminal Tracking Network and Systems, the Inter-operable Criminal Justice System and the National Automated Fingerprint Identification System, launched on 17 August 2022, the forensic apparatus feeds the national record that policy is made from and that connects a case in one State to a record in another.

Where the importance is not yet matched: the honest part

Capacity. The duty in s.176(3) attaches to a very large fraction of the serious criminal docket, and the number of trained forensic personnel available is a fraction of what it implies. The five-year notification window and the express permission to borrow another State's facility are the statute's own admission of the gap. Exhibit pendency in State laboratories runs into months and in some divisions years.

Scrutiny. The second proviso to s.330, efficient as it is, places the burden of triggering scrutiny on a defence that has not seen the bench notes, which sits uneasily with the caution urged in Ramesh Chandra Agrawal v. Regency Hospital Ltd., (2009) 9 SCC 709, holding that opinion evidence is advisory and the court is not bound by it.

Conclusion. Forensic science laboratories are important to Indian criminal administration at every stage. They help the police, and since s.176(3) of the Sanhita they now attend the scene of every offence punishable with seven years or more. They help the prosecution by proving elements no witness can prove, from the quantity of a narcotic drug under the NDPS Act as governed by Hira Singh to the working condition of a firearm under the Arms Act. They help the courts by supplying, through ss.329, 330 and 336 of the Sanhita, a self-proving report that allows thousands of routine cases to proceed without an expert attending.

For full marks, cover: this is the third ballistics question on this scan and the only one whose stem names prosecuting and the criminal judicial system. That changes the balance. The science should be given compactly, because the same paper has already invited a full scientific treatment at Q8; the marks here are in what happens once the case is in court. There is a Supreme Court line running from 1950 to 2023 on the necessity of ballistic evidence, and reproducing it accurately, with facts, is worth eight or nine marks on its own. Structure the answer as detection, then prosecution, then the authorities, then the limits.

The science, compactly

Forensic ballistics applies internal ballistics, covering everything from the strike of the firing pin to the muzzle, external ballistics, covering the flight, and terminal ballistics, covering the impact and, in its medical branch, the wound. In method it is a specialised branch of tool-mark examination: a firearm unavoidably marks what passes through it.

It locates the firer, by reconstructing the trajectory from the entry point, any intermediate perforation and the resting place of the projectile, combined with the distribution of ejected cases.

It estimates the range from the residue pattern at the entry wound, which is what separates suicide, almost always contact or near contact, from homicide, usually at a distance, and from accident.

It establishes direction, by distinguishing entry from exit through the inverted margins and abrasion collar of the entry against the everted margins of the exit, subject to the shored exit exception, and by internal against external bevelling in the skull.

It may connect a person to a discharge, through primer residue particles containing lead, barium and antimony together, identified by scanning electron microscopy with energy dispersive X-ray analysis, the older dermal nitrate or paraffin test being discredited.

It links scenes, because the same weapon leaves the same striations on exhibits recovered from separate offences.

It tests the oral evidence. A wound showing neither soot nor tattooing cannot have been inflicted at the close range a witness describes. The relationship is governed by Solanki Chimanbhai Ukabhai v. State of Gujarat, (1983) 2 SCC 174: medical evidence is ordinarily corroborative, proving that the injuries could have been caused as alleged and nothing more, and the defence may use it affirmatively to show that they could not have been so caused; it displaces eyewitness testimony only where it rules out the eyewitness account altogether, which firearm evidence is one of the few classes able to do.

It reaches the court efficiently. The opinion is relevant under s.39(1) of the Bharatiya Sakshya Adhiniyam, 2023, with the grounds relevant under s.45. The report is admissible under s.329 of the Bharatiya Nagarik Suraksha Sanhita, 2023, the Director, Deputy Director or Assistant Director of a Central or State Forensic Science Laboratory being a Government scientific expert under sub-section (4)(e); the Court may summon and examine him, and where he cannot attend personally he may depute a responsible officer conversant with the facts. By the second proviso to s.330 no expert is called unless a party disputes the report, and s.336 requires the successor in the post to depose where the examiner has been transferred, retired or died.

Sukhwant Singh v. State of Punjab, (1995) 3 SCC 367, decided on 28 March 1995. An empty cartridge case had been recovered from the scene of the shooting and a pistol with live cartridges had been seized from the appellant when he was arrested, and the prosecution sent neither to the ballistic expert, so no comparison was ever made. The Supreme Court held that in cases where injuries are caused by firearms the opinion of the ballistic expert is of considerable importance where both the firearm and the crime cartridge are recovered during the investigation, because the comparison could have supplied the link between the crime and the accused, and that the failure to produce the expert opinion before the trial court in such cases affects the creditworthiness of the prosecution case to a great extent.

Pritinder Singh @ Lovely v. State of Punjab, 2023 INSC 614, decided on 5 July 2023 by Gavai and Karol JJ, applied that proposition and acquitted. There was no evidence that the gun belonged to the accused, and the ballistic expert had not been examined to show that the wad and pellets recovered had been fired from the empty cartridges found. The Court described the failure to examine the ballistic expert as a glaring defect in the prosecution case which, taken with serious doubts about the extra-judicial confession and the last-seen evidence, left the prosecution short of proof beyond reasonable doubt.

The limits, which a complete answer must give

Striation comparison has no measured error rate. The conclusion is a judgment that agreement is sufficient, with no numerical threshold, made by an examiner who ordinarily knows which weapon the investigation favours, and checked by a colleague who knows his conclusion, which is the classical condition for contextual bias.

Barrels change with use, cleaning and corrosion, so striations are not perfectly stable, and a bullet recovered from a body is frequently too deformed to compare.

Most Indian firearm crime involves the worst material for the discipline: smoothbore and country-made weapons impart no rifling marks, so comparison is confined to the cartridge case where one exists at all.

Gunshot residue proves proximity, not firing. It is lost within hours by washing, wiping and ordinary activity, transfers from vehicles, handcuffs and officers who have fired, and settles on bystanders.

For full marks, cover: the command is "explain the use", which asks for a survey by purpose rather than a list plus three expositions, and the stem pairs "crime control" with "prevention", which are different things. The first paper in this scan sets the same question at Q3 in slightly garbled English and that answer is organised by deterrence, detection and proof. This one is organised by who benefits: the device that helps the offender's victim before the offence, the one that helps the investigator after it, the one that helps the prosecutor at trial, and the one that helps the accused. That is an unusual arrangement and it exposes something the usual one hides.

Devices that protect before the offence

Prevention operates on the offender's calculation, by raising the effort, raising the perceived risk and reducing the reward, and it leaves no case behind.

Their use is now partly compulsory. Section 176(3) of the Bharatiya Nagarik Suraksha Sanhita, 2023 requires that, on information of an offence punishable with seven years or more, the officer in charge of the police station shall, from such date as may be notified within a period of five years by the State Government, cause a forensic expert to visit the scene and cause videography of the collection.

In the laboratory, the gas chromatograph with mass spectrometer separates a mixture by retention time and identifies each component by its fragmentation pattern; the thermal cycler and capillary genetic analyser perform DNA profiling; the comparison microscope performs firearm and tool-mark comparison; the video spectral comparator and the electrostatic detection apparatus perform questioned document work; and the scanning electron microscope with energy dispersive X-ray analysis identifies gunshot residue particles of lead, barium and antimony.

Section 39(1) of the Bharatiya Sakshya Adhiniyam, 2023 makes expert opinion relevant, s.39(2) makes the Examiner of Electronic Evidence notified under s.79A of the Information Technology Act, 2000 an expert, and s.45 makes the grounds relevant. Section 329 of the Sanhita allows the report of a Government scientific expert, the Chemical Examiner, the Chief Controller of Explosives, the Director of the Finger Print Bureau, the Director of a Central or State Forensic Science Laboratory and the Serologist, to be used as evidence, with the second proviso to s.330 relieving him of attendance unless a party disputes it.

The exclusionary power of the laboratory. DNA excludes far more often than it identifies, and a suspect eliminated at the laboratory is a suspect who is never charged. In Nandlal Wasudeo Badwaik v. Lata Nandlal Badwaik, (2014) 2 SCC 576, a test at the Central Forensic Science Laboratory, Hyderabad excluded the appellant as the biological father, and the Supreme Court held that where there is a conflict between a conclusive proof envisaged by law and proof based on scientific advancement accepted by the world community, the latter must prevail.

The camera pointed at the police. In Paramvir Singh Saini v. Baljit Singh, (2021) 1 SCC 184, decided on 2 December 2020, the Supreme Court, dealing with custodial violence, directed installation of closed circuit cameras with night vision and audio and video at every entry and exit point, lock-up, corridor, lobby, reception, veranda, Inspector's room, station hall and compound of every police station, with footage preserved for eighteen months and never less than a year, and the same in the offices of central agencies that interrogate and hold accused persons, grounding all of it in Article 21. Body-worn cameras are the mobile counterpart and are what in practice discharge the videography duties in ss.105, 176(3) and 185 of the Sanhita.

The cost, which falls on everyone

Under s.4(2) of the Criminal Procedure (Identification) Act, 2022, records of measurements are retained for seventy-five years, with destruction available only to a person not previously convicted who is released without trial, discharged or acquitted after exhausting all remedies, and even then subject to the court directing otherwise. That has never been tested against the proportionality requirement in K.S. Puttaswamy v. Union of India, (2017) 10 SCC 1, and the Digital Personal Data Protection Act, 2023 supplies no check, exempting processing for the prevention, detection, investigation or prosecution of an offence by s.17(1)(c) and notified State instrumentalities by s.17(2)(a). And the accuracy cost is real: Mohd. Aman v. State of Rajasthan, (1997) 10 SCC 44 set aside a conviction on a chance fingerprint because the specimen prints had been taken three times without the Magistrate's order the law then required and the exhibit had been in police custody with the accused.

For full marks, cover: like Q6 on the first paper of this scan, this stem is confined to India, and global material belongs only where it explains an Indian development. The command is "give a detail account", which invites completeness rather than argument. Q6 runs the story by period; this answer runs it by class of institution, taking each strand of the Indian apparatus, chemical, identification, documentary, biological, educational and statutory, and carrying it from its origin to the present in one pass. That arrangement is better at showing how the modern structure was assembled and it makes the dates easier to remember, because each strand has only three or four.

Strand one: the chemical laboratories, from 1849

Indian forensic science begins with chemistry, and the reason is that poisoning was the offence the colonial administration found hardest to prove and most feared.

Strand two: the identification bureaus, from 1858, where India led

William Herschel, a magistrate at Jungipoor in Bengal, began taking finger impressions on contracts in 1858 and over decades established that the patterns do not change, which is the first empirical demonstration of permanence anywhere.

The competing system was Alphonse Bertillon's anthropometry, introduced at Paris in 1879, and an Anthropometric Bureau was set up at Calcutta in 1892, the first in India. It failed because the eleven measurements were not reproducible between operators, demonstrated conclusively in 1903 by two unrelated prisoners at Leavenworth, both named West, with effectively identical measurements.

In 1897 the world's first Fingerprint Bureau was established at Writers' Building, Calcutta, after the Governor General's Council approved a committee report recommending that fingerprints be used to classify criminal records. Its superintendent was Edward Richard Henry, and the classification named after him, used across the British Empire and much of the world for a century, was substantially the work of two Indian sub-inspectors, Azizul Haque and Hem Chandra Bose.

Strand three: the document examiners, from 1906

The office of the Government Examiner of Questioned Documents was established at Shimla in 1906, the first document examination unit in the country, and was followed by Kolkata in 1964 and Hyderabad in 1968. All three are now under the Directorate of Forensic Science Services. A note forgery section was created in the Bengal Criminal Investigation Department in the following decade.

The strand's modern legal position is worth a sentence, because it is anomalous: the Government Examiner of Questioned Documents is not named among the Government scientific experts in s.329(4) and comes in only through the new clause (g), which admits any other scientific expert specified by notification. The weight of the resulting opinion remains unsettled between Magan Bihari Lal v. State of Punjab, (1977) 2 SCC 210, which treated substantial corroboration as almost a rule of law, and Murari Lal v. State of Madhya Pradesh, (1980) 1 SCC 704, which denied that any such rule exists; and State (Delhi Administration) v. Pali Ram, (1979) 2 SCC 158 warns a court against basing a finding on its own comparison under what is now s.72 of the Bharatiya Sakshya Adhiniyam, 2023.

Strand five: the laboratories and the educational institutions, from the 1950s

After independence the task was to build a national network. State Forensic Science Laboratories were established from the 1950s, and every State now runs one with regional and district laboratories and mobile units beneath it, the Maharashtra Directorate of Forensic Science Laboratories at Kalina, Mumbai with regional laboratories at Pune, Nagpur, Nashik and Aurangabad being the pattern. The Central Bureau of Investigation was created in 1963 with its own laboratory.

The central tier is now the Directorate of Forensic Science Services under the Ministry of Home Affairs, controlling seven Central Forensic Science Laboratories: Kolkata, the oldest and a centre of excellence in the biological sciences; Hyderabad, in the chemical sciences; Chandigarh, in the physical sciences; New Delhi, which is under the administrative control of the Central Bureau of Investigation; and Guwahati, Bhopal and Pune, established as Central Forensic Institutes in 2011 and notified as laboratories in 2013.

The Bharatiya Nagarik Suraksha Sanhita, 2023 and the Bharatiya Sakshya Adhiniyam, 2023 came into force on 1 July 2024. The Sanhita requires by s.176(3) that a forensic expert visit the scene of every offence punishable with seven years or more, from a date each State notifies within five years, with videography of the collection; defines the examination of an arrested person in s.51 to include DNA profiling; and empowers a Magistrate under s.349 to order specimen signatures, finger impressions, handwriting and voice samples, even from a person not arrested. The Adhiniyam widens the expert provision in s.39(1) with the words "or any other field" and creates the Examiner of Electronic Evidence in s.39(2).

The strand has one conspicuous gap. The DNA Technology (Use and Application) Regulation Bill, 2019, which would have created a DNA Regulatory Board with power to accredit laboratories and lay down standards, was withdrawn from the Lok Sabha in July 2023.

Conclusion. The development of forensic science in India is best read as six strands assembled over one hundred and seventy-five years. The chemical strand began at Madras in 1849 and still leads the statutory list of Government scientific experts. The identification strand ran from Herschel at Jungipoor in 1858 through the Anthropometric Bureau at Calcutta in 1892 to the world's first Fingerprint Bureau at Calcutta in 1897, whose Henry classification was substantially the work of Azizul Haque and Hem Chandra Bose, and continues through NAFIS in 2022 and the Criminal Procedure (Identification) Act, 2022. The documentary strand began at Shimla in 1906.

The biological strand began at Calcutta in 1910 and produced an indigenous DNA probe at Hyderabad in 1988, accepted judicially in Kunhiraman v. Manoj in 1991. The institutional strand built the State laboratories from the 1950s, the Central Bureau of Investigation in 1963 and the seven Central Forensic Science Laboratories now under the Directorate of Forensic Science Services, with education consolidated by the National Forensic Sciences University Act, 2020. And the statutory strand, from 2022 to 2024, has made forensic attendance at the scene a duty and DNA profiling a statutory technique, while leaving the laboratories themselves unregulated because the DNA Bill was withdrawn in July 2023, a gap the Supreme Court filled by direction in Kattavellai in July 2025.

The starting proposition

The International Criminal Police Organization has 196 member countries and its headquarters at Lyon in France. It was founded at Vienna in 1923, reconstituted in 1946 and given its present name and Constitution in 1956, and India joined on 15 October 1949. It has no power to investigate and no power to arrest, no territory and no jurisdiction, and no means of compelling a member to do anything. It follows that INTERPOL cannot curb international crime; what it can do is enable 196 national police forces to curb it, which is a real and unsubstitutable contribution and is what the question is about.

Why the enabling role is necessary

Criminal jurisdiction is territorial and criminals are not. The offence is committed in one State, the proceeds move through a second, the offender lives in a third, and each police force sees a fragment. A police force with cross-border powers would answer that and is politically unavailable, because criminal justice is among the last competences any State surrenders. INTERPOL is the design States would accept: no powers of its own, staffed at the national end by each State's own officers, supplying the connective tissue.

Drug trafficking. Databases and operational support address routes, methods and syndicates, and coordinate controlled deliveries, which by definition require two forces to act on one consignment.

Financial crime, corruption and money laundering. These are inter-jurisdictional by nature, and the contribution is asset tracing, rapid alerting and coordination. For India this connects to the Fugitive Economic Offenders Act, 2018, which lets a Special Court declare a person a fugitive economic offender and confiscate his property in India while the international process runs.

Cybercrime. The Global Complex for Innovation at Singapore is devoted to it, and the role is necessarily coordination, because the offender, the infrastructure, the victim and the money are typically in four jurisdictions.

Environmental, wildlife and cultural property crime. Databases on stolen works of art and coordination on wildlife trafficking, both being markets rather than incidents.

The organs are the General Assembly of all members meeting annually; the Executive Committee under the President; the General Secretariat at Lyon under the Secretary General; the National Central Bureau in each member country, which in India is the Central Bureau of Investigation; the Advisers; and the Commission for the Control of Files, an independent body supervising personal data and the only remedy an individual has against the organisation.

Article 2 of the Constitution states the object as the widest possible mutual assistance between criminal police authorities within the limits of the laws existing in the different countries; Article 3 strictly forbids any intervention or activity of a political, military, religious or racial character.

India, and the ceiling on what a notice can do

Bhavesh Jayanti Lakhani v. State of Maharashtra, (2009) 9 SCC 551 fixes the Indian position. The appellant was alleged to have removed a child in breach of foreign custody orders; warrants had issued abroad and a Red Corner Notice had been published; and the Maharashtra police proceeded as though the notice authorised them to act against him.

The limits of curbing

Article 3 cannot be enforced against a determined State, because the organisation must judge political motivation on the material the requesting State supplies, and a State pursuing an opponent presents the case as ordinary crime. Notices and diffusions have been used against dissidents, journalists and refugees; a diffusion, circulated directly by one National Central Bureau to others rather than published by the Secretariat, receives less scrutiny still. The reforms of the last decade, a review task force and a Commission for the Control of Files empowered to order deletion, reduce the abuse without curing its cause.

Consequences precede adjudication. A person subject to a Red Notice may be detained at borders, refused visas and closed out of banking before any court has looked at the merits, and his only direct remedy is to an internal Commission.

The weakest member sets the ceiling. Databases hold what States contribute, cooperation is voluntary, and where a State declines to act the organisation has no remedy at all. It is precisely against States that shelter fugitives that curbing is most needed and least achievable.

Daya Singh Lahoria v. Union of India, (2001) 4 SCC 516, decided on 17 April 2001, establishes the second. The petitioner had been extradited to India from the United States, and the Indian courts sought to try him for offences not named in the extradition decree. The Supreme Court held that a fugitive brought into a country under an extradition decree can be tried only for the offences mentioned in the decree and for no other, and that the criminal courts have no jurisdiction to try him for anything else until he has been returned to the surrendering State or given the chance to return. That is the rule of specialty, embodied in s.21 of the Extradition Act, 1962. It means that the reach of an Indian prosecution is fixed by a document drafted before the fugitive was found.

Conclusion. INTERPOL's functions are four, the secure I-24/7 network, the member-supplied operational databases of which the stolen and lost travel documents database is the most consulted, operational support through specialist units, Incident Response Teams and the Disaster Victim Identification standard resting on fingerprints, dental records and DNA, and capability building, all exercised publicly through the eight notices. Its role in curbing international crime is real but strictly enabling: taken crime type by crime type it locates fugitives, tracks foreign terrorist fighters and sanctioned persons, warns of mobile recidivists and of methods, and coordinates against organised crime, trafficking, drugs, financial crime, cybercrime and wildlife crime, but it curbs nothing itself because it has no power to investigate or arrest.

In India, whose National Central Bureau is the Central Bureau of Investigation and which joined on 15 October 1949, Bhavesh Jayanti Lakhani holds that a Red Corner Notice is not sufficient for an arrest and that surrender depends on the Extradition Act, 1962. Its limits are structural: Article 3 must be applied on the requesting State's own account, a notice's consequences fall before any court reviews them, and the whole system stops where a member State chooses to stop cooperating.

a) Fingerprinting (about 12.5 marks)

The three premises. Individuality: no two fingers, including those of identical twins and two fingers of the same person, bear the same ridge configuration, because friction ridge skin forms between about the tenth and sixteenth weeks of gestation under growth stresses on the volar pads that are not genetically specified. Permanence: the pattern is fixed before birth and grows only in size, superficial injury regenerating identically, with only damage deep enough to destroy the dermal papillae leaving a scar, which becomes an individual characteristic of its own. Classifiability: the patterns fall into a small number of classes, which is what makes searching a large collection possible.

The three types found at a scene. Latent prints are invisible, left by eccrine sweat and sebaceous residue, and must be developed. Patent prints are visible, made when the finger is contaminated with blood, ink, grease or dust, and are photographed rather than developed. Plastic or moulded prints are three-dimensional impressions in putty, wax, soap, wet paint or dust, photographed with oblique lighting and sometimes cast.

Identification is made not on the pattern but on the minutiae: ridge endings, bifurcations, dots, lakes or enclosures, spurs, bridges, crossovers and trifurcations, by the ACE-V method of analysis, comparison, evaluation and verification.

India's place. The Henry classification, used across the world for a century, was worked out at the world's first Fingerprint Bureau, established at Writers' Building, Calcutta in 1897, substantially by Azizul Haque and Hem Chandra Bose under Edward Richard Henry. The modern system is the National Automated Fingerprint Identification System, launched on 17 August 2022, which assigns a ten-digit National Fingerprint Number and returns a candidate list, not an identification.

The criticism. Individuality is not doubted; comparison is. There is no measured error rate, because the conclusion is a judgment of sufficiency; contextual bias operates, since the examiner knows which candidate the investigation favours and the verifier knows his conclusion; and chance marks are partial and distorted. The standing illustration is Brandon Mayfield, matched by the Federal Bureau of Investigation to a mark from the Madrid bombings of 11 March 2004 and confirmed by further examiners, until the Spanish police identified the mark as that of an Algerian national, Ouhnane Daoud.

b) Forensic toxicology (about 12.5 marks)

What it is. Forensic toxicology detects poisons, drugs and their metabolites in biological material and interprets what a concentration means. It divides into post-mortem toxicology, human performance toxicology and forensic drug testing.

Classification of poisons by action: corrosives, the strong acids and alkalis; irritants, including arsenic and mercury; systemic or neurotic poisons, including alcohol, opioids, barbiturates and strychnine; cardiac poisons such as oleander and aconite; and asphyxiants such as carbon monoxide and cyanide.

Interpretation. A concentration is not a conclusion. Post-mortem redistribution means heart blood may greatly exceed peripheral blood, so the sampling site must be recorded; tolerance means a level fatal to one person is therapeutic in a habitual user; decomposition generates ethanol, so an apparent blood alcohol level in a decomposed body may be artefactual; and therapeutic, toxic and lethal ranges overlap.

The law. The Chemical Examiner or Assistant Chemical Examiner to Government is a Government scientific expert under s.329(4)(a); s.39(1) of the Sakshya Adhiniyam makes expert opinion relevant and its first Illustration is the question whether a death was caused by poison; s.123 of the Bharatiya Nyaya Sanhita, 2023 punishes causing hurt by poison or any stupefying, intoxicating or unwholesome drug with intent to cause hurt or to facilitate an offence, and s.103(1) punishes murder; s.185 of the Motor Vehicles Act, 1988 fixes the drink-driving threshold at thirty milligrams per hundred millilitres of blood; and under the Narcotic Drugs and Psychotropic Substances Act, 1985 Hira Singh v. Union of India, (2020) 20 SCC 272 overruled E. Micheal Raj v. Intelligence Officer, NCB, (2008) 5 SCC 161 to hold that the whole weight of the mixture determines the sentencing band.

Semen. The presumptive test is acid phosphatase; confirmation is by microscopic identification of spermatozoa, by the Florence test for choline and the Barberio test for spermine, and by prostate specific antigen, which matters because it is detectable in a vasectomised or azoospermic man in whom no spermatozoa will be found. Saliva is identified by amylase, and hair is examined for human or animal origin, region of the body, whether shed or pulled, and whether the root sheath is present.

Two applications. The diatom test distinguishes ante-mortem from post-mortem drowning, the presence of these algae in the marrow of the femur indicating that water was inhaled while the circulation worked. Forensic entomology estimates the post-mortem interval from insect succession where decomposition has defeated the medical estimates.

DNA in outline. Profiling counts short tandem repeats at agreed loci, with amelogenin indicating sex; the sample is extracted, quantified, amplified by the polymerase chain reaction, separated by capillary electrophoresis and reported as a random match probability. Y-STR identifies a paternal lineage; mitochondrial DNA a maternal one.

Conclusion. Fingerprinting rests on individuality, permanence and classifiability; produces latent, patent and plastic marks developed according to the substrate; classifies patterns into arches with no delta, loops with one and whorls with two, subdivided by ridge counting and ridge tracing; identifies on the minutiae by ACE-V; and rests in Indian law on s.39 of the Sakshya Adhiniyam, s.329(4)(c) and s.349 of the Sanhita and the Criminal Procedure (Identification) Act, 2022, with Mohd. Aman as the standing caution and Mayfield as the standing illustration of the comparison problem.

Forensic toxicology detects and interprets poisons, is dominated in India by organophosphate pesticides and aluminium phosphide, turns on the collection and preservation of viscera under s.194(3) with saturated saline and the exclusion of rectified spirit where alcohol is in issue, and reaches the court under s.329(4)(a). Forensic biology answers, in order, whether material is biological, what it is, what species it came from and whose it is, by presumptive tests that exclude and confirmatory tests that establish, with DNA now answering the fourth question, and its Indian weakness is the custody of the sample rather than the chemistry.