FILE - In this May 8, 2019, file photo, a Douglas County, Colo., Sheriff's Department deputy walks past the doors to the STEM School Highlands Ranch, in Highlands Ranch, Colo. A private security guard who officials say accidentally fired at a deputy and ended up wounding a student during a shooting at the school on May 7, 2019 was not supposed to be armed, The Colorado Sun reported. (AP Photo/David Zalubowski, File) 31/08/2019 - 08:08