California, United States of America
The following excerpt is from The People v. Navarro, F056935, No. VCF187188 (Cal. App. 2010):
"As a general rule, a trial court has wide discretion to admit or exclude expert testimony. [Citations.] An appellate court may not interfere with the exercise of that discretion unless it is clearly abused. [Citation.]" (People v. Page (1991) 2 Cal.App.4th 161, 187.)
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