The insanity defense is an affirmative defense to criminal charges in the state of New York. What Happens If I Plead Insanity?An insanity plea or defense is not a loophole or escape from prison. In fact, most defendants found insane will spend their lives in a psychiatric hospital. Contact us today to learn more. The insanity defense exists to make that distinction for people with a mental disability. Talk to Our Experienced Legal Team Today. Fill Out the Form Below or Call Our Firm at (215) 486-0123.