Sheriffs are not feds. Various types of cops do not generally enforce each other's laws.

One of the more amusing examples happened here in Milwaukee back in aught-five.

The Milwaukee County Sheriff's department had been patrolling the parking lot of the stadium for years. Mostly making sure the tradition of tailgating - partying (and in the Brew City, that means mostly beer) in the parking lot before the game (in which the home team is the Brewers) - goes on in a more or less safe and legal fashion. And for whatever reason, it was decided that the Milwaukee Police Department ought to do it from here on out. No big deal. Except for this little detail: Sheriff's don't give a rat's ass about city ordinances. Ain't their job. City cops do. Is their job. And it turns out that drinking in public parking lots is a violation of a city ordinance. Sensible - parking lots, roads, mostly associated with driving and drinking ought not to be part of that. But the parking lot at the stadium is a public parking lot in the City of Milwaukee, so drinking there is illegal. Which nobody had noticed, because there weren't any city cops around to make a fuss.

That ordinance got amended SO fast...

Anyway, back to the original story. The feds a while back decided to use the local police forces as somebody-else's-tab migra. Told them they could be terrorist-bustin' heroes. Because picking vegetables for cheap is pretty much the same thing as blowing up buildings. Hey, it was a simpler time back then, with simpler people running things and all they had to say was "9/11" and all the little people would just say "OK". But amazingly enough, hick sheriffs, being hick sheriffs, often act like hick sheriffs. So now the guy's being told to hand in the secret decoder ring and get back to work. And he's upset, because he likes to play terrorist-bustin' hero on the TV better than playing sheriff in real life.