That’s Common Knowledge! Failure to Designate an Expert Witness in a Professional Negligence Case is Not Fatal Where “Common Knowledge” Exception Applies

By:  Lyndsey Torp

In reversing summary judgment for defendants, the California Fourth District Court of Appeal recently held that homeowners suing their real estate broker for negligence did not need an expert witness to establish the elements of their causes of action. Ryan v. Real Estate of the Pacific, Inc. (2019) 32 Cal. App. 5th 637. Typically, expert witnesses are required to establish the standard of care in professional negligence cases. But in Ryan, the court of appeal held that the “common knowledge” exception applied despite this general rule, because the conduct required by the particular circumstance of the case was within the common knowledge of a layman.… Read More »

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