Actually, many Sheriffs are on the highways because there is a ton of interdiction, being self-funded from seizures they make. Hillbilly County Sheriff Dept gets $50K of of drug money off the road, it goes to the Sheriff. MSP gets $50K off of I-95, it goes into the states general fund. In the last 10 years since I was traveling to and from Fort Bragg, NC, I was stopped in just about every state along the way. And each county Sheriff that has main smuggling routes is trying to get their share of the pie before it gets to the next county.