California, United States of America
The following excerpt is from People v. Burgin, G046982 (Cal. App. 2013):
When "there is sufficient evidence that a witness is an accomplice, the trial court is required on its own motion to instruct the jury on the principles governing the law of accomplices,' including the need for corroboration." (People v. Tobias (2001) 25 Cal.4th 327, 331; People v. Guiuan (1998) 18 Cal.4th 558, 566 [when accomplice is called solely by prosecution, court must instruct sua sponte that accomplice testimony should be viewed with distrust].)
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