Analogy in Law, and Circumstantial Evidence

The reasoning involved is inductive and it is the form named at sequence 90 as inference to the best explanation. A number of facts are proved. Several explanations are conceivable. The court concludes that one explanation accounts for all of them and the others do not.

The danger in that reasoning is obvious once it is stated. It is that the court may fail to think of the explanation nobody suggested, and having eliminated the two it thought of, treat the third as eliminated too. Indian law meets this danger with a rule.

The five golden principles

Sharad Birdhichand Sarda v. State of Maharashtra, AIR 1984 SC 1622, decided on 17 July 1984, is where the rule is stated in the form now always cited.

Facts. The appellant's wife Manju died of potassium cyanide poisoning at her matrimonial home about four months after the marriage. The prosecution case was that the appellant had administered the poison. There was no direct evidence of administration at all: the case rested entirely on circumstances, namely that the marriage was unhappy, that the appellant was alleged to be involved with another woman, that cyanide was present, and that he had the opportunity. The defence was that Manju, who was deeply unhappy, had taken the poison herself. The trial court convicted and the High Court confirmed.

Held. The appeal was allowed and the conviction set aside. At paragraph 152 the Court set out five conditions which must be fulfilled before a case against an accused resting on circumstantial evidence can be said to be fully established:

(1) the circumstances from which the conclusion of guilt is to be drawn should be fully established;

(2) the facts so established should be consistent only with the hypothesis of the guilt of the accused;

(3) the circumstances should be of a conclusive nature and tendency;

(4) they should exclude every possible hypothesis except the one to be proved; and

(5) there must be a chain of evidence so complete as not to leave any reasonable ground for the conclusion consistent with the innocence of the accused, and must show that in all human probability the act must have been done by the accused.

At paragraph 153 the Court called these five golden principles "the panchsheel of the proof of a case based on circumstantial evidence". On the facts, the possibility that Manju had taken the poison herself had not been excluded, so conditions four and five failed and the conviction could not stand.

Why it matters here. Because every one of the five conditions is a rule of logic given the force of law, and the fourth is eliminative induction stated in a sentence. The Court also drew a distinction that belongs to this syllabus rather than to the law of evidence: it insisted, at paragraph 152, that the circumstances "must or should" be established and not "may be" established, citing the observation that the mental distance between "may be" and "must be" is long and divides vague conjectures from sure conclusions.

The rule did not begin in 1984. Hanumant v. State of Madhya Pradesh, AIR 1952 SC 343, is where Mahajan J first expounded it, and the Court in Sarda called it the locus classicus and reproduced the passage twice.

Facts. Not read, and so not stated here. What was read is the Supreme Court's own reproduction of the passage in Sarda, and Hanumant is cited for that passage alone.

Held. That where the evidence is of a circumstantial nature, the circumstances from which the conclusion of guilt is to be drawn should in the first instance be fully established, and all the facts so established should be consistent only with the hypothesis of the guilt of the accused; that the circumstances should be of a conclusive nature and tendency and should exclude every hypothesis but the one proposed to be proved; and that there must be a chain of evidence so far complete as not to leave any reasonable ground for a conclusion consistent with the innocence of the accused, and such as to show that within all human probability the act must have been done by the accused.

Why it matters here. It is the source of the five conditions, and it shows that the logical structure was in Indian law from the Supreme Court's earliest years.

Reading the five conditions as logic

This is the part of the chapter that a logic paper is actually asking for, and it is worth writing out.

Condition 1, the circumstances must be fully established. The premises of an inductive argument must themselves be proved. An argument whose premises are only suspected proves nothing, and section 2(1)(j) of the Bharatiya Sakshya Adhiniyam 2023 fixes what proof of a fact means.

Condition 2, consistency only with guilt. No rival hypothesis may be consistent with the whole body of proved facts. Note "only": consistency with guilt is not enough, since a set of facts consistent with guilt may be equally consistent with innocence.

Condition 3, conclusive nature and tendency. The resemblance test of analogy, in another dress: the circumstances must be relevant to the conclusion and must point towards it, not merely accompany it.

Condition 4, exclusion of every other hypothesis. Eliminative induction. This is the condition that converts an ordinary inference to the best explanation into something a court may act on, and it is the one prosecutions most often fail, as Sarda itself failed it.

Condition 5, a chain complete beyond a reasonable ground for innocence. The strength requirement, fixed at the criminal standard. It also supplies the image the courts use constantly: a chain is as strong as its weakest link, so a single unproved circumstance breaks the whole.

The one thing the conditions cannot supply. They require every other hypothesis to be excluded, and no rule can make a court think of a hypothesis nobody put forward. That is why a defence has real work to do even where it bears no burden: suggesting the alternative explanation is what makes condition four bite.

A worked example

A watchman is found dead in a locked godown. Proved: the accused had the only other key; he was seen entering at 9.10 p.m.; the watchman was last heard alive at 9.15 p.m.; the accused left at 9.40 p.m. carrying a bag; the deceased had been struck with a heavy object; a bloodstained iron bar was recovered from the accused's house; and the accused had quarrelled with the deceased a week earlier over pilferage.

Condition 1. Each circumstance must be proved to the standard of section 2(1)(j). The recovery is the one most likely to be attacked, because a recovery proves possession and not use.

Condition 2. Are the facts consistent only with guilt? Almost, but the bag is not: a man may leave a godown carrying a bag for many reasons, and it is consistent with everything.

Condition 3. The quarrel is relevant to motive but weakly, being a week old and about pilferage. The key and the timings are strongly relevant.

Condition 4. What other hypotheses exist? That a third person entered with the accused's key before 9.10 and remained; that the deceased was struck after 9.40 by someone with access; that the injury was accidental. Each has to be excluded, and the exclusion has to come from the proved facts, not from the improbability felt by the court.

Condition 5. The chain runs: only key, entry, last heard alive, exit, injury, weapon, motive. Break any link and the chain fails. If the bar cannot be connected to the injury by medical evidence, the chain has a hole where its most important link should be.

The verdict as a logician would report it. A strong inductive argument, conditions one to three broadly satisfied, condition four unsatisfied on the present material because the third-person hypothesis has not been excluded, and condition five accordingly not met. That is the shape of the answer Sarda requires, and it is the shape of an assessment of an inductive argument generally.

Distinctions that carry marks

What this does not mean

Circumstantial evidence is not weaker evidence. Indian courts have said repeatedly that it may be stronger than direct testimony, since circumstances do not lie although witnesses may. What it requires is a stricter method, which is what the five conditions supply.

The five conditions are not a formula for acquittal. They are the conditions on which a conviction may safely rest, and convictions on circumstantial evidence are recorded constantly.

Distinguishing is not evasion. It is the standard test of an analogy, and a court that distinguishes has given a reason that can itself be examined.

Quick revision

Precedent is analogy: the earlier case resembles this one in the respects the earlier decision turned on. Distinguishing attacks the relevance of a resemblance or asserts the relevance of a difference. The ratio is the relevant resemblance.

Circumstantial evidence: evidence of facts from which the fact in issue is inferred. The reasoning is inference to the best explanation.

Sharad Birdhichand Sarda v. State of Maharashtra, AIR 1984 SC 1622, 17 July 1984: the five golden principles at paragraph 152, called the panchsheel at paragraph 153. Conviction set aside because suicide had not been excluded.

Hanumant v. State of Madhya Pradesh, AIR 1952 SC 343: the source of the rule, per Mahajan J.

The five conditions: fully established; consistent only with guilt; conclusive in nature and tendency; exclude every other hypothesis; a chain complete beyond any reasonable ground consistent with innocence.

"May be" against "must be": the mental distance between them divides vague conjectures from sure conclusions.

The limit: no rule can make a court think of an unsuggested hypothesis, which is why the defence has work to do under condition four.

Test yourself

1. Explain why following a precedent is an argument by analogy.

Because the earlier decision is not a rule that contains the present case but another dispute on other facts, and the reasoning runs from the resemblance between the two to the conclusion that they should be decided alike. The respects relied on must be the ones the earlier decision turned upon, which is the relevance test of any analogy. It follows that distinguishing a case is an attack on the analogy, and that a line of decisions across varied facts is stronger than a single decision.

2. State the five golden principles and name the case.

They are stated in Sharad Birdhichand Sarda v. State of Maharashtra, AIR 1984 SC 1622, at paragraph 152, drawn from Hanumant v. State of Madhya Pradesh, AIR 1952 SC 343. The circumstances from which guilt is drawn must be fully established; the facts so established must be consistent only with the hypothesis of guilt; the circumstances must be of a conclusive nature and tendency; they must exclude every possible hypothesis except the one to be proved; and there must be a chain of evidence so complete as to leave no reasonable ground for a conclusion consistent with innocence, showing that in all human probability the act was done by the accused.

3. Which of the five conditions is eliminative induction, and what does it require?

The fourth, that the circumstances exclude every possible hypothesis except the one to be proved. It requires the court not merely to find that guilt explains the facts but to satisfy itself that nothing else does, so that the conclusion is reached by eliminating rivals rather than by selecting the most striking candidate. In Sarda itself the condition failed, because the possibility that the deceased had taken the poison herself had not been excluded.

4. Distinguish direct from circumstantial evidence.

Direct evidence establishes the fact in issue itself, as where a witness says he saw the shot fired. Circumstantial evidence establishes other facts from which the fact in issue must be inferred, as where a witness says he saw a man running from the house with a pistol. In the first, the inference is made by the witness and asserted; in the second, the inference is the court's own work, which is why it is governed by the stricter method laid down in Sarda.

5. What was the significance of the distinction between "may be" and "must be" in Sarda?

The Court insisted that the circumstances must or should be established, not merely may be, and adopted the observation that the mental distance between "may be" and "must be" is long and divides vague conjectures from sure conclusions. In logical terms, a proposition that may be true is one whose falsity has not been excluded, and an argument built on such propositions cannot satisfy the fourth and fifth conditions, however plausible its conclusion appears.

6. What is the limit of the five conditions?

That no rule can require a court to consider a hypothesis nobody has raised. Condition four demands the exclusion of every other explanation, but the court can only exclude explanations it has thought of, so the risk remains that the true explanation was never before it. This is why the defence has real work under this head even though it bears no burden of proof: suggesting the alternative is what gives the fourth condition something to operate on.