1. A defendant is not criminally responsible by reason of insanity if, at the time of the criminal conduct, as a result of mental disease or defect, the defendant lacked substantial capacity to appreciate the wrongfulness of the criminal conduct. [PL 2005, c. 263, §5 (AMD).] 2. As used in this section, "mental disease or defect" means only those severely abnormal mental conditions that grossly and demonstrably impair a person's perception or understanding of reality. An abnormality manifested only by repeated criminal conduct or excessive use of alcohol, drugs or similar substances, in and of itself, does not constitute a mental disease or defect. [PL 1985, c. 796, §5 (AMD).] 3. Lack of criminal responsibility by reason of insanity is an affirmative defense. [PL 2005, c. 263, §6 (NEW).]
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