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expert witness. n. a person who is a specialist in a subject, often technical, who may present his/her expert opinion without having been a witness to any occurrence relating to the lawsuit or criminal case.
However, PTSD is a complicated psychological disorder and a plaintiff will have difficulty making this kind of claim without supporting testimony from an expert witness. This article discusses the role of an expert witness and how expert testimony functions to prove a plaintiff's PTSD in a personal injury case.t is not enough for an expert witness to testify as to their qualifications to diagnose PTSD (although that matters) and then give a diagnosis. An expert must explain to the jury what is required to diagnose PTSD and whether the plaintiff, or a person with the same signs and symptoms as the plaintiff, has PTSD.