There are complementary approaches to reform policing:

0. Citizen-led policing, e.g., what Michael A. Wood, Jr. advocates.

1. Police must face both criminal and civil liability, with mandatory insurance for the latter.

2. Selection must screen for those whom can stay cool: eg those with front-line battle experience don't get scared as easily.

3. Training must be exhaustive, continuous and realistic, situational, diplomacy and use-of-force.

I would also add

* Open sourcing data to promote transparency and integrity.

* Whistle-blower protection of both civilians and law enforcement who witness and report misconduct.

* A national registry for those ever suspended/terminated for serious/repeated misconduct.

* Continual training and development beyond academy training.

* Transfer to different departments after a period of time in one department (as part of continual training).

* Yearly internal reviews by external (national) agencies

Maybe also "record and share everything, (nearly) all the time" in terms of body- and dash-cams.

I think there's a legit concern around sharing everything, since so much of police work involves being a first responder to some really tragic things - I'd be pretty upset if the video of a loved one dying in a car crash popped up on YouTube. But storing everything for some limited period of time seems very reasonable.