The concept of the federal government taking over local police departments has been discussed in the past. The following article was written back in 2011 and even back then this idea was Under consideration.
Though a rapid transition to a federalized police force is unlikely here in America, an incremental shift to greater federal control is already occurring
www.police1.com
I see an incremental take over of the 18,000 police forces in our nations beginning with setting standards for training and procedures for all police departments.
It would be very difficult for the federal government to just take over all policimg just as it is nearly impossible to ban and confiscate all civilian owned firearms.
In such situations the democrats prefer to use the incremental approach to move toward their final goal. With guns it is to ban “assault weapons” than all semi-automatic firearms including pistols and then all handguns. Federalization of local police would follow a similar path.
Hopefully neither draconian gun control or federalization of all police departments will occur. However we now live in a batshit crazy world so it is hard to say for sure what can happen.
The resistance against federalization of police is resistance against Canada's recipe for success with our Mounties. Not the best in the world but not far from it.
America is suffering from a fatally flawed union of the states because of the needed compromises with the South. The question of the south's right to keep slaves was never completely resolved and hence it lives on in a racism issue that's quite unsolvable.
The attempt to allow more renegade city or state police forces is the extremist right's answer to the problem, while a higher federal standard would serve to at least address the racism problem and begin to fix the problem.
Of course America is a long way from accepting anything that could end the south's determination to regard black or brown people as equals to whites.
The US south's issue is so important to them that it's destroying America's democracy. Fascism, secession, or other destructive extremes have become the extreme right's battle cry.
And murder by their police is their only answer to solving the problems!