Final answer:
A patrolman stops a funds escort when they have reasonable suspicion of criminal activity.
Step-by-step explanation:
A patrolman stops a funds escort when they have a reasonable suspicion that the escort is involved in criminal activity. This is based on the principles outlined in Terry v. Ohio where police officers are allowed to stop and frisk individuals if they have reasonable suspicion of a crime. In the context of a funds escort, if the patrolman has reasonable suspicion that the money being transported is connected to illegal activities, they can stop the escort to investigate further.