MBE Rules · Criminal Law
Insanity — other tests
The rule
Irresistible impulse: cannot control conduct due to mental disease. Durham (product test): act was the product of mental disease. MPC §4.01: lacks substantial capacity to appreciate criminality or conform conduct to law. Federal: M'Naghten only, plus burden shift to defendant by clear and convincing evidence.
In plain English
Different tests for insanity determine if someone can be held responsible for a crime due to mental illness. These tests look at whether the person could control their actions or understand their actions were wrong.
Worked example
The defendant, suffering from a severe mental disorder, impulsively steals a car. Under the irresistible impulse test, if they couldn't control their urge due to their condition, they might be found not guilty by reason of insanity.
Memory hook
Crazy Control, Produce Problems. Irresistible impulse = can't control. Durham = act product of disease. Remember: MPC blends both.
The trap
Students think: Federal courts use multiple tests. Wrong, because they use only M'Naghten with a burden shift. The actual test is M'Naghten + clear and convincing evidence.
How examiners test it
The MBE loves: defendant claims insanity with evidence of mental illness. Trap: students confuse MPC with M'Naghten. Focus on jurisdiction and which test applies.
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