California, United States of America
The following excerpt is from People v. Ayala, H042637 (Cal. App. 2017):
"In a criminal case, a trial court has a duty to instruct the jury on ' " ' "the general principles of law relevant to the issues raised by the evidence." ' " ' [Citation.]" (People v. Estrada (1995) 11 Cal.4th 568, 574.) A trial court also has "the duty to screen out invalid theories of conviction, either by appropriate instruction or by not presenting them to the jury in the first place." (People v. Guiton (1993) 4 Cal.4th 1116, 1131.)
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