I think federal law enforcement only has valid jurisdiction on federal land. But that's a philosophical, not a legal, opinion. Sheriffs are charged with the responsibility of maintaining law and order in their counties according to the standards of the inhabitants of that county. Sheriffs have the power to deputize citizens at will to this end. That's a legal opinion. Sending feds in is an egregious overstepping of lawful authority. That's a personal opinion.
