Voluntary intoxication or drug use is almost never the basis for the successful assertion of the insanity defense.

Question

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Voluntary intoxication or drug use is generally not considered a valid basis for an insanity defense because the defense typically requires a mental disease or defect that impairs the defendant's ability to understand the nature and quality of their act or to distinguish right from wrong, which is not typically applicable to self-induced intoxication states.

Voluntary Intoxication or Drug Use Is Almost Never the Basis