California, United States of America
The following excerpt is from The People v. Jackson, G041185, Super. Ct. No. 04ZF0075 (Cal. App. 2011):
expert is permitted to assist the jury in understanding a gang member's motive in shooting or committing a crime when there appears to be no provocation or ordinary reason. (See People v. Williams (1997) 16 Cal.4th 153, 192-193.)
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