Can an expert testify on the basis of hearsay?

Further, "[e]xpert testimony may be founded on material that is not admitted into evidence and on evidence that is ordinarily inadmissible, such as hearsay, as long as the material is reliable and of a type reasonably relied upon by experts in the particular field in forming opinions." (People v. Duran (2002) 97 Cal.App.4th 1448, 1463.) "Thus, a gang expert may rely upon conversations with gang members, his or her personal investigations of gang-related crimes, and information obtained from colleagues and other law enforcement agencies." (Ibid.) Brame cites no authority for the proposition that the

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