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This episode contains strong language and scenes of violence. \n\nOver the past five years, police officers in the United States have killed more than 400 unarmed drivers or passengers \u2014 a rate of more than one a week, a Times investigation has found.\n\nWhy are such cases so common, and why is the problem so hard to fix?\n\nGuest: David D. Kirkpatrick, a national correspondent for The New York Times.