- (a) In a prosecution for a crime, it is an affirmative defense that when the defendant engaged in the criminal conduct, the defendant was unable, as a result of a mental disease or defect, to appreciate the nature and quality of that conduct.
- (b) The affirmative defense defined in (a) of this section may not be raised at trial unless the defendant, within 10 days of entering a plea or such later time as the court may for good cause permit, files a written notice of intent to rely on the defense.
- (c) Evidence of a mental disease or defect that is manifested only by repeated criminal or other antisocial conduct is not sufficient to establish the affirmative defense under (a) of this section.
- (d) The affirmative defense specified in (a) of this section is the affirmative defense of insanity. A defendant who successfully raises the affirmative defense of insanity shall be found not guilty by reason of insanity and the verdict shall so state.