'May Presume', 'Shall Presume' and 'Conclusive Proof' (s. 2(1)) — BSA (Law of Evidence) Notes

‘May Presume’, ‘Shall Presume’ and ‘Conclusive Proof’ (s. 2(1))

A presumption is the law’s shortcut: it lets a court treat one fact as proved once another is shown, without waiting for direct proof. But shortcuts come in different strengths — some the judge may refuse to take, some he must take but can be argued out of, and one he must take and may never reconsider. These three settings are “may presume”, “shall presume” and “conclusive proof”, and the exam tests whether you can tell them apart.

Think of a presumption like a dimmer switch on the court’s belief, running from optional to locked. All three are defined in s. 2(1) and all three are inferences the law draws from one proved fact to another.

A. ‘May presume’ (s. 2(1)(h)) — discretion

Where the Act says the court may presume a fact, the court has a choice: it may either regard the fact as proved (unless and until it is disproved) or call for proof of it. It is a discretionary (rebuttable) presumption — the weakest setting. The court is permitted, not commanded, to presume.

Illustration: under s. 119 BSA the court may presume that a man in possession of goods soon after a theft is either the thief or a receiver, unless he explains his possession. The judge may draw that inference — or may insist on proof.

B. ‘Shall presume’ (s. 2(1)(l)) — mandatory but rebuttable

Where the Act says the court shall presume a fact, the court has no choice about presuming — it must regard the fact as proved unless and until it is disproved. So the presumption is compulsory, but it can still be rebutted by contrary evidence. It shifts the burden onto the other side to disprove it.

Illustration: under s. 118 BSA (dowry death), once it is shown that a woman was subjected to cruelty for dowry soon before her death, the court shall presume that her husband or his relative caused the dowry death — but the accused may lead evidence to disprove it.

C. ‘Conclusive proof’ (s. 2(1)(b)) — locked

Where one fact is declared by the Act to be conclusive proof of another, the court, on proof of the first fact, shall regard the other as proved and shall NOT allow any evidence to be given to disprove it. This is the strongest setting — an irrebuttable presumption. The door is shut; no contrary evidence is even admitted.

Illustration: under s. 116 BSA, the birth of a child during a valid marriage is conclusive proof of legitimacy — displaceable only by proof of non-access, and otherwise not open to contradiction.

So the ladder runs: may presume (court may or may not) → shall presume (must, but rebuttable) → conclusive proof (must, and rebuttal forbidden).

🧩 WORKED EXAMPLE — reading the strength of a presumption

Facts. Three provisions: (i) the court may presume a man missing seven years is dead; (ii) the court shall presume a dowry death on proof of cruelty; (iii) birth in wedlock is conclusive proof of legitimacy.

Rule. “May presume” = discretion; “shall presume” = mandatory but rebuttable; “conclusive proof” = mandatory and irrebuttable (s. 2(1)(h), (l), (b)).

Apply. In (i) the judge may decline to presume death and call for proof. In (ii) the judge must presume, but the accused may lead rebutting evidence. In (iii) the judge must find legitimacy and will refuse to hear evidence to the contrary (save non-access).

Conclusion. The three phrases are graded strengths of the same device — spot the phrase, and you know exactly how much room the other side has left.

Section 2(1)(b), BSA 2023: “‘Conclusive proof’ means when one fact is declared by this Adhiniyam to be conclusive proof of another, the Court shall, on proof of the one fact, regard the other as proved, and shall not allow evidence to be given for the purpose of disproving it.”

In Simple Terms: “Conclusive proof” is the law saying: once you prove fact A, fact B is settled — and I will not even listen to evidence trying to unsettle it. It is the only one of the three that forbids rebuttal.

flowchart TD
    ROOT["Presumptions (s. 2(1))"]:::root
    ROOT --> A["May presume (h)<br/>discretion — judge may or may not<br/>e.g. s. 119"]:::leaf
    ROOT --> B["Shall presume (l)<br/>mandatory but REBUTTABLE<br/>e.g. s. 118 dowry death"]:::leaf
    ROOT --> C["Conclusive proof (b)<br/>mandatory + IRREBUTTABLE<br/>e.g. s. 116 legitimacy"]:::diamond
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    classDef leaf fill:#E6F3FF,stroke:#1E3A8A,color:#000;
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Case Laws

Sodhi Transport Co. vs State of U.P. (1986) — explained “shall presume” as a rebuttable presumption of law that shifts the burden to the party denying the presumed fact.
Sethani vs Bhana (1993) — a “conclusive proof” clause bars any evidence to the contrary; the presumed fact cannot be disproved.

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