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.
Yes, it is practical. We can stop giving local police departments Bearcats and tanks and use those funds to equip them all with mandatory bodycams. It will require no more manpower to monitor, as it would only be to review in the case of incident, the same as dashcams now. They just run and run and the only time it matters is when there is an incident to review. Since the funding will come from things police departments are currently buying and don't need (military-grade weapons and vehicles), it will cost no further funding as well, and may even save money in the long run as police brutality complaints and lawsuits decline when officers start behaving because they're being held responsible for their actions.