This is a great read over at Predator Armament… Basically there was some research done as to why police chiefs support strict civilian disarmament while local sheriffs do not.
The findings? Basically, its all about toeing the political line that their higher-ups are forcing them to toe. They love their lucrative careers and will do what ever their bosses tell them to. Sheriffs on the other hand are elected officials and stand with the people.