California, United States of America
The following excerpt is from People v. Roots, C061656, Super. Ct. No. SF107537A (Cal. App. 2011):
trial court abuses its discretion if it admits evidence of an uncharged crime that is not necessary to establish a disputed factual issue. (See People v. Leon (2008) 161 Cal.App.4th 149, 169 [trial court abused its discretion by admitting evidence of the defendant's prior robbery to show gang participation when the record already contained "overwhelming evidence" establishing that fact].)
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