Here are two articles from the Root. One argues that the US system of treating the police force of each municipality as a being unto itself has led to incompetent and unaccountable police work across the nation. The article recommends a more standardized national system to train and certify police officers. This echoes much of what David Simon argued about Baltimore's police department in an article I linked to some time ago.
The second article points out that systemic racism in the US justice system is exceedingly lenient on white offenders that end up being truly dangerous (giving the example of Dylann Roof's going free after multiple episodes of stalking, trespassing, and possession of hard drugs). It contrasts this with the many well-publicized recent cases in which black men who have committed no crime are incarcerated or killed by the police.