California, United States of America
The following excerpt is from People v. Vasquez, C065319 (Cal. App. 2012):
The trial court must instruct sua sponte on a defense if it appears defendant is relying on such a defense, or if there is substantial evidence supportive of such a defense that is not inconsistent with defendant's theory of the case. (People v. Maury (2003) 30 Cal.4th 342, 424.)
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