A spate of court cases in the USA involving white police officers shooting and in some cases killing black Americans have prompted calls for police reform.
At a training center in the Los Angeles suburb of Rialto, police officers rehearse dangerous calls through interactive virtual backdrops of houses and yards. These cops go into action already wearing the body cameras recommended by proposed reforms. They record every detail of an incident from the officer's perspective. The resulting video footage could be used as evidence should a case go to court.