Let's start a list of suggested improvements to the police system, in no particular order.
1) The actions of police officers in uniform must be videotaped at all times while on duty, via cameras carried on their person, perhaps encorporated into their uniforms.
2) Patrol cars need to be equipped with cameras which are always active, recording all the important angles of both the exteriors and interiors of the vehicles.
3) It must be the responsiblity of the police officer to ensure that all equipment is operational at all times.
4) The penalties for failing to meet the above requirements need to be severe, and applicable to everyone involved in the officer surveillance process - meaning that not only is an individual officer responsible for ensuring their own cameras are operational, but secondary parties responsible for the analysis or retention of footage after it has been collected must also ensure that such data is never "lost" or "misplaced".
5) Use of force must be given as little tolerance, and require as much concrete justification, as reasonably possible, and must be severely punished when deemed insufficiently justified.
Add your own ideas, folks! Change only happens when we first take the time to talk about making it happen!