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Insanity is a defense to certain crimes that require proof of intent.
A few states have abolished the insanity defense but allow psychiatric evidence at trial on the issue of intent. For example, a defendant in a drug case could not have formed the intent to sell an illegal substance if he was delusional and believed that he was a doctor dispensing medication. Most states require formal notice of plans to raise the insanity defense. Such defendants enter a plea of not guilty and proceed to trial. If convicted, such an individual may be found guilty, not guilty by reason of insanity, or in a few states, guilty but mentally ill.