California, United States of America
The following excerpt is from Garibay v. Hemmat, 161 Cal.App.4th 735, 74 Cal.Rptr.3d 715 (Cal. App. 2008):
"In professional malpractice cases, expert opinion testimony is required to prove or disprove that the defendant performed in accordance with the prevailing standard of care [citation], except in cases where the negligence is obvious to laymen. [Citation.]" (Kelley v. Trunk (1998) 66 Cal.App.4th 519, 523, 78 Cal.Rptr.2d 122.)
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