Criminal Responsibility & Insanity Defense Legal Matrix

Comparative jurisprudence and forensic psychiatric analysis across M'Naghten, MPC/ALI, Volitional, GBMI, and Abolition doctrines.

Forensic Profile

18%
Threshold: <20% M'Naghten; <45% Model Penal Code
12%
Threshold: <15% Irresistible Impulse; <45% MPC

Comparative Doctrinal Outcomes MPC / ALI: Qualified NGRI

M'Naghten Rule (Pure Cognitive)
Qualifies NGRI

Contested on moral wrongfulness prong; defense establishes total inability to comprehend moral wrongfulness.

Irresistible Impulse Test
Qualifies NGRI

Exculpatory under volitional prong due to complete loss of behavioral inhibition.

Model Penal Code / ALI (Substantial Capacity)
Qualifies NGRI

Substantial lack of capacity to appreciate criminality or conform conduct to law.

Guilty But Mentally Ill (GBMI)
GBMI Verdict

Standard penal sentence with initial psychiatric treatment before transfer to general prison population.

Abolition / Strict Incapacitation (ID, KS, MT, UT)
Guilty (No Defense)

Non-defense; mens rea evaluated strictly without affirmative insanity excuse.

Disposition & Civil Forensic Commitment Pathway:
Immediate indeterminate civil commitment to high-security forensic psychiatric facility with periodic judicial review and statutory discharge thresholds (Foucha v. Louisiana compliance).

Statutory Jurisdiction Reference Explorer

Legal Standard Cognitive Prong Volitional Prong Representative States
M'Naghten Total Inability Excluded CA, FL, GA, NJ, PA, TX, VA, Federal
MPC / ALI Substantial Lack Substantial Lack CT, MD, MA, NY, OR, WI
Irresistible Impulse Secondary Total Destruction CO, NM, OH, VA (Supplementary)
Strict Abolition Mens Rea Only Excluded ID, KS, MT, UT, AK (Restricted)
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