mandatory body cams rolling at all times unless they are in a bathroom.
turning off or a malfunctioning camera during the act of a police brutality event immediately pierces the qualified immunity defense and they are tried as citizens.
have an outside investigative body that has zero ties to the police department investigate any reports of abuse.
have another outside investigative body that has zero ties to the police department randomly sampling police stop footage to see if there are any instances of impropriety.
I am sure this list is non-exhaustive but it's a start. also, while we are here, fix the issue of civil asset forfeiture. the clear "we get to take your money because it looks suspicious and then keep it for the police department" is a huge conflict of interest.
[0] https://en.wikipedia.org/wiki/Quis_custodiet_ipsos_custodes%...
For what it is worth, I have not been questioned by a police officer for something I did or did not do. I do think that me having the mindset that I am always being watched in public helps me better police myself, so I think the more obvious and ever-present version might instill a similar feeling in others.
At the same time, I can see that having this footage available has a slippery-slope effect when it comes to privacy and authoritarian control. However, this issue of groups of people using technology to control or manipulate others is fundamentally a non-technical issue to me because these people exist irrespective of that technology's existence.