Michael Brown, an unarmed black teenager, was shot by a white police officer in Ferguson, Missouri. Demonstrations against police violence have been going on since, which the police have met with tanks and army gear.
Dutch police training was revised when the police realized the need to adapt to post-war society's anti-authoritarianism. They shifted from rigidly applying the law to focusing on social skills such as deescalation strategies.
For police accountability and guaranteed quality, police training must take place on a state level, independent of the culture within individual police forces.
During police firearms training, why not teach officers to aim for the shoulder or leg? There would be decidedly fewer lethal police shootings if cops didn't have the license to use lethal force every time they felt threatened.