What state? These are local departments. If you want armed agents of the State, that is exactly what the protesters want. They believe replacing local police with a Federal Police force would solve these problems.
Merely in theory anymore, see qualified immunity. Click on that link and read it and prepare for your blood to boil.
Let me know if it's broken, earlier I posted the capsule description of the cases where the govt. actions were held as protected by qualified immunity.