Often overlooked is the difference between the head of a county police force, vs the sheriff of a county.
As a "hired" employee, the police chief, public safety director, or whatever title the head of the county police force has is directly responsible for his / her actions and decisions to a county board.
As an elected official, the sheriff of a county is directly responsible to his / her constituents.
This difference can make for interesting politics. For instance, in nearby Charlotte / Mecklenberg County, N.C., county government has encouraged the police department to take a hands-off approach to arresting identified illegal aliens in the community.
At the same time, the sheriffs department has chosen to take an agressive approach to illegal aliens, working hand-in-hand with ICE on identifying and arresting them. They have undertaken this approach because that's what the voting public says they want law enforcement to do.