The following excerpt is from USA. v. Murillo, 255 F.3d 1169 (9th Cir. 2001):
During a traffic stop, a police officer is allowed to ask questions that are reasonably related in scope to the justification for his initiation of contact. See United States v. Baron, 94 F.3d 1312, 1319 (9th Cir. 1996). In order to broaden the scope of questioning, he must articulate suspicious factors that are particularized and objective. See id.
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