I'm not usually for mass surveillance, but I've seen reports of successfully altered behavior by cops who wear body cameras. Perhaps it would be a good idea to have all cops wear such cameras as a mandatory prop as long as they're on duty.
It is a good suggestion to keep the cops under surveillance. But is it practical to make all of them wear body cams? The initial cost, as well as maintenance will be huge. And there is no guarantee that they will not damage / tweak them. Also we need more manpower to manually monitor all of them.
Is it practical to give them all guns and tasers and pepper spray. Cameras are badly needed to stop them from murdering innocent people or just straight up abusing their powers. I'm not from the states but even in my country the cops abuse their powers and hassle you for no good reason. Of course you must comply and if you give them any attitude back they just abuse their power even more to hassle you further. Cameras will really keep them in check and help them with their own safety as well as others.