California, United States of America
The following excerpt is from People v. S.N. (In re S.N.), E055823 (Cal. App. 2014):
Gang experts may testify concerning the modus operandi of the gang and its members. (People v. Prince (2007) 40 Cal.4th 1179, 1223, citing People v. Jenkins (1975) 13 Cal.3d 749, 755 [officer testified as expert that tools found in defendant's car were commonly used in burglaries].)
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