It happened moments after a police sergeant blasted a shot into a sand-filled barrel to test this city’s expanded gunfire tracking system. Witnesses suddenly heard “Pop-pop-pop-pop-pop!” Those gunshots were real. A flashing red “multiple shots” banner and an address appeared on a nearby laptop, and officers quickly located a 28-year-old man who had been shot by a masked man. He survived. “He’s lucky,” Capt. Carl Estelle said. East Palo Alto, Calif., is the first U.S. city completely wired with ShotSpotter.
