Bring Your Own Body-Cam

from here

Officer-worn video cameras aren't ideal for establishing officer accountability. They're better at capturing details to justify police action (and thereby cover the officer's arse) than at capturing the officer doing things they shouldn't be doing. Surveillance, after all, is a tool of the state and tools of the state can't be easily turned against the state.

Citizen-worn video cameras (aka souveillance) on the other hand are much better at capturing improper police action because they can be pointed at cops and because the police can't disable them or obstruct their view (so long as the police action isn't against the wearer, so some redundancy may be called for) .