The issue focused on one story of an incident in which a white police officer shot and killed a black man, Michael Brown, who was unarmed. The issue also followed the decision by two Texas officials to pull their officers from duty after they were caught on video shooting and killing a black suspect.

[What you need to know about the Eric Garner grand jury]

In those cases, both officers said that they felt threatened by the suspects, but no physical evidence showed that was the case. In New York