One protection for people liable to be confronted by the police, and for the police themselves, is the the technology that allows these to be recorded, both cameras attached to the police, and phones carried by observers.

It puzzles me that there are objections by police to such filming, because if they are doing their job properly, this protects them against unfounded charges. If they are not doing their job prerly, they are in fact endangering their colleagues, and the sooner they are identified and retrained or fired the better.

It's the same with the introduction of video into police interrogation of suspects. It protects the police every bit as much as the prisoners.

The same goes for video surveillance of staff in care situations.