Viral video of an encounter in NYC's Central Park shows a white woman calling 911 to report another park user is threatening her life, apparently trying to provoke a violent police response against the "African American man" who had simply asked her to leash her dog.
Read MoreAnother horrific episode of police violence, captured on video in Minneapolis, graphically recalls the 2014 killing of Eric Garner by NYPD officers who were never criminally charged in his death. This time the officers may face charges, but prosecuting police is still notoriously difficult. Is there hope for justice?
Read MoreThe Minnesota police officer who killed Philando Castile has been acquitted, despite video evidence of the shooting seen by the jury. How did this happen?
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