N.Y. Penal Law § 40.15: Mental disease or defect

§ 40.15 Mental disease or defect.

In any prosecution for an offense, it is an affirmative defense that

when the defendant engaged in the proscribed conduct, he lacked criminal

responsibility by reason of mental disease or defect. Such lack of

criminal responsibility means that at the time of such conduct, as a

result of mental disease or defect, he lacked substantial capacity to

know or appreciate either:

1. The nature and consequences of such conduct; or

2. That such conduct was wrong.