About 10 years ago, my nephew graduated from college in FL. He was going through TX on his way home to WA when he was stopped by a state cop. He was never given a reason for the stop and they didn't ask if they could search the car, they just did it. They brought in a drug dog and about dismantled his car...finding nothing. My nephew has always been a drug hater. He figures the only possible reason he was stopped was because of his long hair and beard.
Good interdiction officers don't profile, because the people who look like a doper to the average Joe are what they call "ducks". The big boys know better than to look like smugglers and these guys don't want to be bothered with a pound of weed or and ounce of crack. They stop everybody and let them talk themselves into jail. Then again, a lot of the biggest dope hauls are made from completely innocent (probably) carriers such as trucks hauling loads. We got 100 kilos of cocaine from the trunk of a crown vic driven by some poor old guy who was just transporting the vehicle from what he thought was one dealership to another.