We can do this. It will not stop all incidences of undue and unlawful police violence, but it will make violent and unhinged cops think twice before they start blasting away.
It will also provide future grand juries with some objective evidence with which to evaluate police claims of being in life or death situations. You can also make the case that is will help honest and decent police (and I’m sure there are some out there) defend themselves against spurious charges.