California, United States of America
The following excerpt is from People v. Flores, G044509 (Cal. App. 2012):
Further, as long as an expert's testimony is reliable, "even matter ordinarily inadmissible, such as hearsay, can form the proper basis for an expert's opinion testimony. [Citation.] Thus, a gang expert may rely upon conversations with gang members, on his or her personal investigations of gang-related crimes, and on information obtained from colleagues and other law enforcement agencies. [Citations.]" (People v. Hill, supra, 191 Cal.App.4th at pp. 1121-1122.)
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