In what circumstances will the court allow evidence that other defendants may have committed a similar crime to the one charged?

In People v. Scott, 218 Cal.App.2d 249, at pages 253--254, 32 Cal .Rptr. 225, at page 228, the court stated: 'Where the identity of the defendant is in issue, evidence that he committed other crimes or attempts under circumstances which were remarkably similar to the one charged may be admitted for the purpose of showing that the defendant did in fact commit the crime charged. (People v. Cavanaugh (1955) 44 Cal .2d 252, 265--266, 282 P.2d 53.)' This statement of the rule is supported by overwhelming authority.