Article 20: The Protections of an Accused

Broken down

Clause (1) has two limbs, and students routinely notice only the first.

1. No retrospective offence. The act must have been an offence under a law in force when it was done.
2. No retrospective enhancement of penalty. Even where the act was already an offence, the punishment may not exceed what could have been inflicted then.

The clause speaks only of being "convicted" and "subjected to a penalty", and says nothing about procedure or evidence. It is therefore not a general prohibition on retrospective legislation: a retrospective tax is not touched by it, nor is a civil liability.

Clause (2) has four conditions, all required: (i) a prosecution, (ii) followed by a punishment, (iii) for the same offence, (iv) before a court of law or a judicial tribunal.

Clause (3) has three: the person must be (i) accused of an offence, (ii) compelled, (iii) to be a witness against himself. Remove any one and the clause does not apply.

What "prosecuted and punished" means

Facts. Maqbool Hussain v. State of Bombay, 1953 AIR 325, 1953 SCR 730, decided 17 April 1953. The Sea Customs Authorities proceeded against the appellant under section 167 of the Sea Customs Act 1878 and confiscated his gold, with an option to pay a fine of Rs. 12,000 instead. He was then prosecuted under section 23 of the Foreign Exchange Regulation Act 1947 for the same act, and pleaded article 20(2). Heard with it was the case of detenus punished by a Jail Superintendent for a hunger strike and then complained against before a Magistrate.

Held. The customs proceeding was not a prosecution and the confiscation not a punishment inflicted by a court or judicial tribunal, so the second prosecution was not barred. Article 20(2) "incorporated within its scope the plea of 'autrefois convict' as known to the British jurisprudence or the plea of double jeopardy as known to the American Constitution but circumscribed it by providing that there should be not only a prosecution but also a punishment in the first instance in order to operate as a bar".

The words "before a court of law or judicial tribunal" are not in article 20(2), but the protection can be invoked only where "there must have been a prosecution and punishment in respect of the same offence before a court of law or a tribunal, required by law to decide the matters in controversy judicially on evidence on oath", and not before a departmental or administrative enquiry. The Superintendent's action failed the same test.

Why it matters. It fixes the boundary of clause (2) and explains why so many people who feel punished twice have no constitutional complaint. Departmental proceedings, customs adjudications and disciplinary action are not prosecutions before a judicial tribunal, so a criminal trial may follow them.

What "compelled to be a witness against himself" means

Facts. Nandini Satpathy v. P.L. Dani, 1978 AIR 1025, 1978 SCR (3) 608, decided 7 April 1978. The appellant, a former Chief Minister of Orissa, was named as an accused in a first information report alleging assets disproportionate to her known sources of income. Directed to a Vigilance police station, she was handed a long string of written questions. She refused to answer, claiming article 20(3), and the police complained against her under section 179 of the Penal Code, which punishes refusal to answer a public servant lawfully authorised to question.

Held. The appeals were allowed and the prosecution quashed. The prohibitive sweep of article 20(3) "goes back to the stage of police interrogation, not, as contended, commencing in Court only", and it and section 161(2) of the Code of Criminal Procedure 1973 "substantially cover the same area so far as police investigations are concerned". "Accused of any offence" means "formally accused in praesenti not in futuro". To be a witness against oneself means more than the court process: "Any giving of evidence, any furnishing of information, if likely to have an incriminating impact, answers the description of being witness against himself."

Compelled testimony is "evidence procured not merely by physical threats or violence but by psychic torture, atmospheric pressure, environmental coercion, tiring interrogative prolixity, overbearing and intimidatory methods and the like", and the protection covers answers that would expose the person in other pending or imminent proceedings. But "fanciful claims, unreasonable apprehensions, and vague possibilities cannot be the hiding ground for an accused person. He is bound to answer where there is no clear tendency to criminate." If an accused asks for his lawyer to be present when he is examined the facility must not be denied, and the police must warn him of the right to silence and record that warning.

Why it matters. Before this case clause (3) was largely a courtroom rule; after it the guarantee reaches the place where the pressure is applied. It also supplies the working test: not whether an answer is confessional, but whether it has a reasonable prospect of exposing the person to a criminal charge.

The guarantee against a new technology

Facts. Selvi v. State of Karnataka, AIR 2010 SC 1974, (2010) 7 SCC 263, decided 5 May 2010 by three judges. A batch of criminal appeals raised the involuntary administration of three techniques on accused persons, suspects and witnesses: narcoanalysis, in which a drug lowers inhibition; the polygraph, which measures physiological responses; and brain mapping, the Brain Electrical Activation Profile test.

Held. "The compulsory administration of the impugned techniques violates the 'right against self-incrimination'." The protective scope of article 20(3) extends to the investigative stage and, read with section 161(2) of the Code of Criminal Procedure 1973, "protects accused persons, suspects as well as witnesses who are examined during an investigation". It protects the choice between speaking and remaining silent "irrespective of whether the subsequent testimony proves to be inculpatory or exculpatory", and these results "bear a 'testimonial' character" and are not material evidence.

Compulsion also violates article 21, being an "unjustified intrusion into the mental privacy of an individual" and amounting to "cruel, inhuman or degrading treatment"; nor can the techniques be read into the medical examination provisions in the Explanation to sections 53, 53A and 54 of the Code. So "no individual should be forcibly subjected to any of the techniques in question, whether in the context of investigation in criminal cases or otherwise". A voluntary test is permitted with safeguards, but even then the results are inadmissible in themselves, because the subject does not exercise conscious control over his responses; material later discovered with their help may be admitted under section 27 of the Evidence Act 1872.

Why it matters. It applies a 1950 text to a problem its drafters could not have imagined, and answers the argument that a technique which does not hurt cannot be compulsion: the article protects a choice, not a body. It also joins clause (3) to article 21 and to privacy, dealt with in [Privacy], so the objection survives even where the person tested is a witness.

A worked example

A State Act published on 1 June 2026 makes possession of a listed chemical an offence punishable with three years, and applies to possession from 1 January 2026. Ramesh was found with it in March 2026; customs had confiscated it and imposed a penalty in April. The police now summon him, require answers, and ask him to take a polygraph test.

Step one, the retrospective offence. Article 20(1) allows no conviction "except for violation of a law in force at the time of the commission of the Act charged as an offence". In March 2026 possession was not an offence, so the conviction cannot stand. Had it already been an offence carrying one year, the first limb would be satisfied and the second not: article 20(1) also forbids a penalty "greater than that which might have been inflicted under the law in force at the time".

Step two, the customs penalty. On Maqbool Hussain the customs adjudication is not a prosecution and punishment before a court or judicial tribunal, so article 20(2) does not bar the trial.

Step three, the questioning. Named in the first information report, he is "formally accused in praesenti", so clause (3) applies from the police station. He may decline questions with a reasonable prospect of exposing him to guilt here or in an imminent case, and may ask for his lawyer; but on Nandini Satpathy he must answer where there is no clear tendency to criminate.

Step four, the polygraph. On Selvi he cannot be compelled. If he consents, the results are still not evidence against him; only what is discovered through them may be proved.

The two rules against being tried twice

What it does NOT mean

It does not mean "never tried twice". Clause (2) needs a prosecution and a punishment. A person acquitted at the first trial is protected by the ordinary criminal law, not by clause (2), and a student who writes that the Constitution guarantees autrefois acquit has misstated Maqbool Hussain.

It does not mean a departmental enquiry is barred by a trial, or a trial by an enquiry. That follows from the forum requirement, and is the commonest real question asked of the clause.

It does not mean an accused may refuse everything. Clause (3) protects against furnishing information with an incriminating tendency; it does not license silence at large, and Nandini Satpathy says so in terms.

It does not mean consent cures everything. Selvi permits a voluntary test and still refuses to admit its results, because the objection is also reliability and the absence of conscious control.

Why article 20 is different from the rest of Part III

Article 359(1) allows the President, during a Proclamation of Emergency, to suspend the right to move any court to enforce Part III rights. Since the Constitution (Forty-fourth Amendment) Act 1978, with effect from 20 June 1979, the words are "the rights conferred by Part III (except articles 20 and 21)". Both articles are outside the suspension power altogether.

That amendment answered what happened when article 21 could be suspended, described in [Article 21: From Gopalan to Maneka]. Article 20 is one of only two rights that survive an Emergency intact, and the only one with no internal exceptions at all.

Quick revision

• Article 20 protects "no person": a foreigner has it exactly as an Indian does.
• Clause (1): no conviction except for violation of a law in force when the act was done, and no penalty greater than the one then available. Neither limb touches procedure, evidence or civil liability.
• Clause (2): prosecuted and punished, for the same offence, before a court or judicial tribunal. Maqbool Hussain: customs confiscation is none of these, and an acquittal does not attract the clause.
• Clause (3): a person formally accused, compelled, to be a witness against himself.
• Nandini Satpathy: the protection begins at police interrogation; "compelled" includes psychic torture; the accused may ask for his lawyer; vague apprehension is no shield.
• Selvi: no forcible narcoanalysis, polygraph or brain mapping; voluntary only, results inadmissible in themselves, discoveries admissible under section 27 of the Evidence Act.
• Articles 20 and 21 cannot be suspended under article 359, since the Forty-fourth Amendment.

Test yourself

1. Set out the four conditions of article 20(2) and explain which one defeated the appellant in Maqbool Hussain.

2. A person is acquitted and prosecuted again for the same offence. Does article 20(2) help him?

3. What did Nandini Satpathy decide about the meaning of "accused of any offence" and about the stage at which article 20(3) begins to operate?

4. "Compulsion means force." Test that against Nandini Satpathy and Selvi, and say why the results of a voluntary narcoanalysis test are still inadmissible.

5. Which fundamental rights survive a Proclamation of Emergency untouched, and what provision says so?