[thaumasiotes]

> Those are issues (though nobody will allow federally funded police departments in the US).

What? Not only are those allowed, we already have them. That's what the FBI is.

Also, if funding is your concern, it's routine for state police to be federally funded.

[DiscourseFan]

As Scythe pointed out, because in the US the vast majority of policing is not federally funded, its not at all uniform, so the effects of the FBI and CIA and other federal agencies in toto is negligible. And state-police, while having a larger effect than the federal agencies, also have significantly less power over local jurisdictions than local police departments. The US--and honestly this is to its credit--has remarkably strong local police departments that are funded predominantly by the residents they police. This is even parodied, or criticized, in media when they show "small town america" cops who are either totally incompetent because there is almost never crime in the town, or are in league with nefarious forces and have to be investigated by outside agencies (see Killers of the Flower Moon, which is specifically about the formation of the FBI for that purpose, even if it has expanded its purview since the early 20th century.)

Even if state police are federally funded, why does that matter? The use of that funding is still under the power of the state (or else it would be unconstitutional, for the federal government to direct how state institutions are operated).

[thaumasiotes]

> Even if state police are federally funded, why does that matter?

It matters quite a bit to the question of whether federally funded police would ever be allowed. You stated outright that they weren't.

> The use of that funding is still under the power of the state (or else it would be unconstitutional, for the federal government to direct how state institutions are operated).

The normal way in which federal funding operates is that they direct its usage. You're not compelled to do what they want, but if you don't, they don't give you the money.

[DiscourseFan]

When I said "allowed," I meant at a mass scale, at every level, uniformly in a centralized system, not some funds for specific purposes here and there. Now, certainly, there have been times when that sort of federal funding has been specifically intended to more centralize policing in the US, but in general the structure of the state is such to prevent that, unless there is a serious change to US law.