Usage patterns
〈人〉がお巡りさんに道を聞くto ask a police officer for directions
I asked a police officer for directions in front of the station.
お巡りさんに捕まるto get caught/stopped by a police officer
I got stopped by a police officer for riding my bike without a light on.
お巡りさんが〈場所〉を巡回するa police officer patrols a place
A police officer is patrolling the park at night.