Another variation of the insanity defense is the irresistible impulse defense. This defense has lost popularity over the years and is rejected by most of the states and the federal government. 1 In some cases, the irresistible impulse insanity defense is easier to prove than the M’Naghten insanity defense, resulting in the acquittal of more mentally disturbed defendants.
The irresistible impulse insanity defense generally supplements M’Naghten, so the focus is on the defendant’s awareness (cognitive) and the defendant’s will (ability to control conduct). In jurisdictions that recognize the irresistible impulse insanity defense, the first element is the same as M’Naghten; the defendant must suffer from a mental defect or disease of the mind. However, the second element adds the concept ofvolition, or free choice. If the defendant cannot control his or her conduct because of the mental defect or disease, the defendant’s conduct is excused even if the defendant understands that the conduct is wrong. 2 This is a softer stance than M’Naghten, which does not exonerate a defendant who is aware conduct is wrong. The challenge for the trier of fact in an irresistible impulse jurisdiction is distinguishing between conduct that can be controlled and conduct that cannot.
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