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Criminal Procedure

University of Florida Levin College of Law

2021

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The Status And Legitimacy Of M’Naghten’S Insane Delusion Rule, E. Lea Johnston, Vincent T. Leahy Jan 2021

The Status And Legitimacy Of M’Naghten’S Insane Delusion Rule, E. Lea Johnston, Vincent T. Leahy

UF Law Faculty Publications

This Article investigates jurisdictions’ compliance with M’Naghten’s directive for how to treat delusions in insanity cases and assesses the validity and reasonableness of courts’ application of the law. Most U.S. jurisdictions employ an insanity test roughly modeled on the rule articulated in the 1843 M’Naghten’s Case. This test focuses on a defendant’s inability to know, because of a mental disease, the nature of her act or its wrongfulness. But the M’Naghten judges also issued a second rule — particular to delusions — that has received much less attention. This rule holds that, when the defendant labors under a “partial delusion …