If she was on private property, they would have a right to stop her to find out what she was doing there since they were patrolling that private property. However, CHP will not be able to testify as to her operating the vehicle and the security gurards would have to testify to that part. Security guards and police need some grounds to stop someone, but not exactly PC, they need reasonable suspicion. PC is only required to arrest.i Once they have reasonable suspicion, then they can develop PC if they detect the odor of alcoholic beverage on the driver. Thus, they will have to articulate some reasonable suspicion for stopping her, such that they believed that there may be some crime being comitted or suspicious activity involved.
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