Substantive US Criminal Law

Sun, 05 Jul 2026 00:00:00 +0000

Sources of Substantive Criminal Law

Criminal law in the United States operates under a dual sovereignty system: federal criminal law derived from Congress’s enumerated powers coexists with fifty distinct state criminal codes. The American Law Institute’s Model Penal Code (MPC), promulgated in 1962, has been the most influential template for state criminal codification, adopted in whole or substantial part by 37 states. The MPC’s comprehensive approach — defining general principles of liability, grading offences, and standardising terminology — transformed American criminal law from a patchwork of common law doctrines into a more systematic body of law. Federal criminal law remains uncodified in the MPC sense, scattered through Title 18 of the United States Code (USC) and over 300 additional federal statutes, with no general part comparable to the MPC.

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Substantive US Criminal Law

Sources of Substantive Criminal Law