I say it time and time again, but police arent idiots. They know where every parlor is. There are many reasons that they dont raid each location. Dont be concerned about unmarked cars, be more concerned if someone from work or a relative sees your car in the parking lot. Cops and FBI agents have highly stresfful jobs and actually keep parlors and strip clubs in business. I knew a few dancers who would pick out the FBI agents in the club to me all the time.