Section 17 BNS 2023: Act Justified by Law or by Mistake of Fact
Section 17 of the Bharatiya Nyaya Sanhita, 2023 is a general exception. It protects an act that is justified by law and, subject to the statutory conditions, an act done by a person who in good faith believes because of a mistake of fact that the law justifies the act.
Current legal status: The Bharatiya Nyaya Sanhita, 2023 is Act No. 45 of 2023. Section 17 forms part of Chapter III, titled "General Exceptions". The BNS came into force on July 1, 2024, except for Section 106(2). That exception to commencement does not affect Section 17.
Official text of Section 17, Bharatiya Nyaya Sanhita, 2023
17. Act done by a person justified, or by mistake of fact believing himself justified, by law.
Nothing is an offence which is done by any person who is justified by law, or who by reason of a mistake of fact and not by reason of a mistake of law in good faith, believes himself to be justified by law, in doing it.
Illustration to Section 17
A sees Z commit what appears to A to be a murder. A, in the exercise, to the best of his judgment exerted in good faith, of the power which the law gives to all persons of apprehending murderers in the fact, seizes Z, in order to bring Z before the proper authorities. A has committed no offence, though it may turn out that Z was acting in self-defence.
What Section 17 means
Section 17 recognizes two situations. First, an act is not an offence when the person is actually justified by law in doing it. Second, the protection may apply when the person is not in fact justified but, because of a mistake of fact, honestly and in good faith believes that the law justifies the act.
The provision expressly distinguishes a mistake of fact from a mistake of law. A mistaken understanding of the law itself is not covered by the wording of Section 17. The mistaken belief must arise from facts and must satisfy the requirement of good faith.
Essential requirements of Section 17
- Justification by law: The act may be protected where law actually authorizes or justifies it.
- Mistake must concern fact: Where actual legal justification is absent, the belief in justification must arise from a mistake of fact.
- Not a mistake of law: The section expressly excludes a belief based merely on misunderstanding the law.
- Good faith is necessary: The belief in legal justification must be held in good faith.
- Connection between the facts and the act: The mistaken factual circumstances must be such that the person believes those circumstances legally justify the act done.
Meaning of "good faith" under the BNS
Section 2(11) of the Bharatiya Nyaya Sanhita defines "good faith". Nothing is said to be done or believed in good faith if it is done or believed without due care and attention. Accordingly, a bare assertion of honest belief is not enough; the statutory definition makes due care and attention relevant to the claim of good faith.
Mistake of fact and mistake of law
Mistake of fact
A mistake of fact concerns a factual circumstance. The statutory illustration is an example: A sees conduct that appears to be murder and, acting in good faith on that factual appearance, seizes Z to bring Z before the proper authorities. The protection may apply even though it later turns out that Z was acting in self-defence.
Mistake of law
A mistake of law concerns what the law permits, prohibits or requires. Section 17 specifically states that the relevant belief must arise from a mistake of fact and not from a mistake of law.
Section 17 and nearby general exceptions
Section 17 should be read in the context of the surrounding general exceptions. Section 14 deals with an act done by a person bound by law, or by mistake of fact believing himself bound by law. Section 15 deals with acts of a Judge when acting judicially. Section 16 deals with acts done pursuant to a judgment or order of a Court.
The following provisions continue the sequence of general exceptions: Section 18 addresses accident in doing a lawful act; Section 19 addresses an act likely to cause harm but done without criminal intent to prevent other harm; and Section 20 concerns an act of a child under seven years of age.
Practical note: Whether Section 17 applies in a particular case depends on the facts, the legal authority relied upon, the nature of the alleged factual mistake, and whether the claimed belief satisfies the statutory requirement of good faith.