In a September 19, 2016 article on police unions in The New Yorker,  Sam Walker stated that certain police union contract provisions create a “culture of impunity,” meaning the belief that they do not have to answer for their conduct. One of the most common contract provisions in this regard are 48-hour “waiting periods” before an officer can be questioned by a department supervisor about a critical incident (a use of deadly force or a use of excessive force incident, for example). Walker also pointed out that years ago police unions learned they could neutralize mayors by threatening to accuse them of being “soft” on crime. This tactic is usually called “playing the crime card.”

Read The New Yorker article: policeunionsnewyorker