What standard governs the admissibility of expert testimony in states that follow Frye v. United States?
QUESTION
Under General Electric Co. v. Joiner, what standard of review applies to a trial court's ruling on expert testimony?
QUESTION
Under FRE 704(b), what may an expert not state in a criminal case?
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ANSWER
An opinion on whether the defendant had a mental state that is an element of the crime or defense. Under Diaz v. United States, an expert may testify about what most people in a group know, without addressing the defendant's own state.