The following excerpt is from U.S. v. Segna, 555 F.2d 226 (9th Cir. 1977):
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.
Wade v. United States, 426 F.2d 64, 71-72 (9th Cir. 1970) (en banc).
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