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Ball/Oberman Crim Law Casebook

Model Penal Code sec. 4.01

Section 4.01. Mental Disease or Defect Excluding Responsibility.

  (1) A person is not responsible for criminal conduct if at the time of such conduct as a result of mental disease or defect he lacks substantial capacity either to appreciate the criminality [wrongfulness] of his conduct or to conform his conduct to the requirements of law.

  (2) As used in this Article, the terms "mental disease or defect" do not include an abnormality manifested only by repeated criminal or otherwise anti-social conduct.