(a) Evidence of mental disease, mental defect, or mental disorder shall not be admitted to show or negate the capacity to form any mental state, including, but not limited to, purpose, intent, knowledge, premeditation, deliberation, or malice aforethought, with which the accused committed the act. Evidence of mental disease, mental defect, or mental disorder is admissible solely on the issue of whether or not the accused actually formed a required specific intent, premeditated, deliberated, or harbored malice aforethought, when a specific intent crime is charged.

(b) As a matter of public policy there shall be no defense of diminished capacity, diminished responsibility, or irresistible impulse in a criminal action or juvenile adjudication hearing.

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Terms Used In California Penal Code 28

  • Evidence: Information presented in testimony or in documents that is used to persuade the fact finder (judge or jury) to decide the case for one side or the other.
  • state: when applied to the different parts of the United States, includes the District of Columbia and the territories, and the words "United States" may include the district and territories. See California Penal Code 7

(c) This section shall not be applicable to an insanity hearing pursuant to Section 1026.

(d) Nothing in this section shall limit a court’s discretion, pursuant to the Evidence Code, to exclude psychiatric or psychological evidence on whether the accused had a mental disease, mental defect, or mental disorder at the time of the alleged offense.

(Amended by Stats. 2002, Ch. 784, Sec. 528. Effective January 1, 2003.)