What is the duty of a trial court to instruct a defendant on a particular defense?

A trial court's duty to instruct, sua sponte, on particular defenses arises only if it appears that the defendant is relying on such a defense, or if there is substantial evidence supportive of such a defense and the defense is not inconsistent with the defendant's theory of the case. (People v. Maury (2003) 30 Cal.4th 342, 424.) ""'[A]n honest and reasonable belief in the existence of circumstances, which, if true, would make the act for which the person is indicted an innocent act, has always been held to be a good

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