California, United States of America
The following excerpt is from People v. Liu, B266352 (Cal. App. 2016):
An expert witness may offer opinion testimony if the subject is sufficiently beyond common experience that it would assist the trier of fact. (Evid. Code, 801.) A trial court has broad discretion to determine the admissibility of expert testimony, and its ruling is reviewed for an abuse of that discretion. (People v. McDowell (2012) 54 Cal.4th 395, 426.)
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