California, United States of America
The following excerpt is from People v. Cardenas, F062414 (Cal. App. 2012):
presence at a crime scene does not suffice to establish aiding and abetting; however, acts tending to demonstrate aiding and abetting include presence at the scene of the crime, companionship, and conduct before and after the crime. (People v. Miranda, supra, 192 Cal.App.4th at p. 407.)
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