California, United States of America
The following excerpt is from People v. Legaspi, F065549 (Cal. App. 2014):
CALCRIM No. 301 instructs the jury the testimony of a single witness can prove any fact, but warns the jury to review carefully all the evidence before accepting the testimony of a single witness.3 The trial court has a sua sponte duty to instruct the jury with this instruction in every case. (People v. Rincon-Pineda (1975) 14 Cal.3d 864, 885.) The trial court failed to do so here.
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