What is the burden of proof against an aider and abettor in a criminal case?

Common sense dictates "an aider and abettor must have criminal intent in order to be convicted of a criminal offense." (People v. Beeman (1984) 35 Cal.3d 547, 556, 199 Cal.Rptr. 60, 674 P.2d 1318.) The burden of proof on the prosecution is to show a defendant, as an aider and abettor, acted with knowledge of the criminal purpose of the perpetrator and with an intent or purpose either of committing, encouraging, or facilitating commission of the target offense. (Id. at p. 560, 199 Cal.Rptr. 60, 674 P.2d 1318.)