.... Peace Officer is a feature documentary about the increasingly militarized state of American police as told through the story of William "Dub" Lawrence, a former sheriff who established and trained his rural state's first SWAT team only to see that same unit kill his son-in-law in a controversial standoff 30 years later.  Driven by an obsessed sense of mission, Dub uses his own investigative skills to uncover the truth in this and other recent officer-involved shootings....