There's a great series of videos online showing police Use of Force training, including local media types going through scenarios. Police training can and should always improve in quality and quantity, and police will always need to weed out the sadists etc who can be attracted to a job allowing use of force, or the jumpy and scared, or those with poor decision making skills, and even occasionally some racists . Body cameras are one great accountability idea. https://www.youtube.com/watch?v=QjNL9HzfdX0
But why is the BEST video online helping people understand how to behave with the cops a Chris Rock comedy short? As a BLM activist who went thru a training said, after gaining appreciation for the unique problems police face, we need this Compliance Training for civilians badly. The government should fund PSA's teaching people how to comply with cops. By example, the tragedy that happened with Philandro Castille might have been avoided if the Latino officer had better training, but clearly video shows the cop though Mr. Castille was reaching for a gun, and reasonably so. It DEFINATELY would have been avoided if Mr. Castille, who clearly acted in good faith and was a tragic victim, had been more knowledgeable about the details of Proper Compliance. He was polite, he informed the cop he had a gun, he meant well, all good, but then he reached without permission or warning to a place the cop couldn't see. "I have a gun" and reaching to your back pocket might alarm anyone, but Police, with their training specifically aimed at such threats, will react even more strongly.
We need a two pronged approach to reducing problems with police encounters. The Chris Rock Rules are a good start but clearly insufficient.