California, United States of America
The following excerpt is from People v. Berry, B227545 (Cal. App. 2012):
A trial court has wide discretion to admit or exclude expert testimony. (People v. Valdez (1997) 58 Cal.App.4th 494, 506.) We review the trial court's ruling for abuse of discretion. (People v. Mayfield (1997) 14 Cal.4th 668, 766.)
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