What is the test for unanimity in determining whether a defendant was a direct perpetrator or an aider and abettor?

Jurors are not required to decide unanimously whether a defendant was a direct perpetrator or an aider and abettor. (People v. Wilson (2008) 44 Cal.4th 758, 801.) In Culuko, supra, 78 Cal.App.4th 307, the court held that a trial court does not err in instructing jurors that there is no unanimity requirement concerning whether the defendant was a perpetrator or an accomplice. Even if jurors could not decide whether a defendant was the perpetrator or an aider and abettor "it would be 'absurd . . . to let the defendant go free because each individual juror had a reasonable doubt as to [her] exact role.' " (Id. at p. 323.) Bitson demonstrates no error.