Technology in the form of video is rewriting the news about how and when police use excessive or deadly force. The Washington Post devoted several pages on April 12 to an analysis of 54 criminal cases against police officers in fatal shootings across America the past decade, among “the thousands of fatal police shootings that have occurred across the country in that time.” No one knows the exact number. Retired Charlottesville Police Chief John deKoven Bowen reacted strongly to the number. "That surprises me. That bothers me,” said Bowen, the city’s chief of police...