What you’re not accounting for is all the people they pulled over that didn’t have drugs and you never heard about.
That's the excuse Customs and Border Protection uses to make Kavanaugh stops on brown people in the 100-mile zone on the New York border.
If you're the correct dark shade of brown and have an Ontario, Quebec, or other out of state plate, a white-and-green Suburban will fly out of a hidden parking spot next to a trailhead entrance, pull you over, and start harassing you and assume you're a drug mule.
There are tell tales and cops are good at seeing them. Mass surveillance really isn't needed for that police work.