High tech, low tech: Big U.S. cities embrace twin approach to crime

Gun violence in major U.S. cities fell in 2017 as police used the latest crime-fighting software combined with a revival of old-fashioned community policing to build trust with a skeptical public.Law enforcement officials and criminologists credit that dual approach with helping extend the decades-long reduction in crime in New York City and reducing gun violence in Chicago by 20 percent in 2017.Chicago became a symbol of U.S. gun violence after homicides soared nearly 60 percent in 2016, drawin