EDIT:
Contrast: In Washington State, an investigation about the death in Tacoma a couple months ago was just this mentioned in a news conference by the governor. Due to conflicts of interest the state is currently evaluating who can be assigned to lead a fully independent and unbiased investigation, with new announcements expected in the next few days.
The problem is that said investigations always seem to drag their feet, never going further than the paid leave, and never seem to actually get to the things that are meant to be a punishment (firing, arrest, etc).