Mistake about the need for force in criminal self-defense: Under NY law, a reasonable mistake is a defense.

• A. It is always a defense.
• B. It is never a defense.
• C. It is a defense only if the mistake is reasonable.
• D. It mitigates the crime but is not a defense.

Answer: (C)

Reasonableness of the belief about necessity drives self-defense in New York. If a defendant reasonably believes that force is necessary to prevent imminent harm, that belief justifies the use of force and serves as a complete defense to the charged offense. A mistaken belief can still be a defense only if that mistake was reasonable given the circumstances; an unreasonable mistake does not excuse the conduct. Therefore, a reasonable mistake about the need for force is a defense, while an unreasonable one is not. The defense is not automatic in all cases, and it does more than merely mitigate the crime.