I know many/most can't stand Bill Simmons, but his
podcast with DeRay Mckesson from
Campaign Zero is pretty interesting. Their research lead to the
8 can't wait list of 8 policies that their research says decreases police violence by 72% (if all 8 are implemented).
The policies don't seem mostly intuitive, but apparently many departments don't have them as policy and very few have all 8.
A few things that surprised me as not part of the 8. More black police officers. Apparently it only begins to help when the percentage is above 35%, which he said isn't feasible in a lot of places. Body cams, while great, for some reason aren't as effective as the other policies. Community policing he said, while it's good for morale and a great thing, they didn't find much evidence of it decreasing police violence.