Not really. An insanity plea is a plea of “not guilty,” based on the premise that a person whose mental capacity is diminished so that they don’t understand their actions or their results shouldn’t be punished. A person can be insane and still be convicted of the crime if they are found to have understood that what they were doing was wrong at the time of the crime, and such a person may be incarcerated in a mental institution instead of a prison. But if you’re convicted of the crime, your insanity plea failed.
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