People v. Drew
California Supreme Court
22 Cal. 3d 333 (1978)
While at a bar, Ronald Drew confronted another patron, accusing him of stealing money. When police officers tried to escort Drew outside, Drew struck one of the officers, causing the officer to hit his head on the bar. Drew was charged with battery on a peace officer, obstructing an officer, and disturbing the peace. At the sanity phase of trial, two psychiatrists testified that Drew suffered from latent schizophrenia and that, when in a schizophrenic state, he was likely unable to tell right from wrong.
Whether the insanity defense applies if the defendant, as a result of mental disease or defect, lacks substantial capacity either to appreciate the criminality of his conduct or to conform his conduct to the requirements of law.