What best describes insanity defense?

• A. It is a self-defense claim
• B. It is an affirmative defense to prosecution
• C. It requires admission of guilt
• D. It is a legal defense used by civil cases

Answer: (B)

An insanity defense is used in criminal law as an affirmative defense to prosecution. The defendant asks the court to excuse criminal liability by arguing that, due to a mental illness or defect at the time of the offense, they were unable to form the required mental state to commit the crime. Because it’s an affirmative defense, the defendant presents evidence of insanity while still acknowledging the conduct happened, but claiming they should not be held legally responsible. It’s not a self-defense claim, and it applies to criminal cases, not civil cases. The defense doesn’t require an admission of guilt to the act; rather, it challenges the mental state element of the crime.