Actually it's interesting you mention that because
I think NIH actually has less oversight/regulations because they aren't subject to USDA inspections? Correct me if I'm wrong.
And I understand your point about the missing oversight and training, but honestly do you really think its any better with other animals who have
no oversight or much less? I'd imagine it's only worse, we just don't see it because it happens in people's homes or in the woods or on farms etc. We do have centralized training facilities here for basic procedures (injections, oral gavage, etc) but you're right, a lot of procedures get trained by PI's training new people who then train newer people etc. And I have seen PI's try to get away with some less than stellar stuff, though I think most of the time it isn't being done maliciously.
But I also know that all the mice here get looked at (cage-side, but still) every single week by a veterinarian (this task consumes a large portion of my time these days). And at other facilities I've been to they get looked at every week to two weeks by trained staff who are cleaning cages, who then report health issues to the veterinary staff. And that's a hell of a lot more frequently than the 80 cats living in a hoarder's house.