My local PD received a gift to finance. I believe the gift was from a private individual. He just wrote a check. I've not seen any reports of it being used yet.
It records things as they happen, not as flawed human minds see it. The flaw can be the policeman, or the suspect, or the victim (all 3 can be victims.)
A while back, before dash cam's became common, the City of Cincinnati actually opposed them. When they started using them on DUIs, their conviction rate actually dropped (not a whole lot, but a significant amount.) What seems to have occurred is juries see an arrest, and hear the policeman's story, and then conclude the answers given by the suspect were reasonable. Not unreasonable as suggested by the arresting officer.
From some of the minor dust ups we see from time to time between police here and the citizens, we see differences of opinion that probably illustrate the same things. What is important isn't the conviction or the number of convictions, its justice.