When will an expert witness not reveal the content of a report prepared or opinion expressed by a nontestifying expert?

California, United States of America

The following excerpt is from Mathews v. Benjamin, 2d Civil No. B264580 (Cal. App. 2016):

"An expert witness may not, on direct examination, reveal the content of reports prepared or opinions expressed by nontestifying experts." (People v. Campos (1995) 32 Cal.App.4th 304, 308.) Permitting the introduction of such reports would be improper because it would deny the adversary the right to cross-examine those who prepared them. (Ibid.)

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