There's a lot there but I read the cited 2015 paper. From it:

Officers knocked on the door; when no one answered, they kicked down the door and took Diggs, who was bleeding from a small facial wound, outside

, according to Prince George’s County, Maryland prosecutors.

When asked about the recent increase in arrests of District of Columbia police officers, Chief Cathy Lanier noted that

Ninety-eight officers were arrested more than once on domestic violence charges between 2007 and 2010

And then:

Part IV asks why, in contrast, police officers are able to abuse their partners with impunity

Kinda sounds like literally every single example in this paper involves some sort of prosecution of the cops who were involved, i.e. not with impunity. No?

This is part of what I was saying -- I think back in 1992, the culture that if a cop beat up his wife or drove drunk, his co workers would look the other way was almost universal. I know it's definitely not universal now. Is it still common? I honestly don't know. But getting a honest answer to that question seems like a vital step in stopping it from happening in the places where it is still happening. Right? Or no?

There are actually much much worse and more systemic stories than these. I'm just saying that it's good to want to arrive at an actual measurement of how often it happens (because it's way different if it's 40% versus 10% versus 4%), and that it's bad to just pick the highest number you can and say that that's obviously what's going on because cops are terrible people. How do we know they're terrible people? Because 40% of them beat their wives, that's how.