OAKLAND, CA – FEBRUARY 16: Consultant Jeff Solomon (C) of D-Prep leads an active shooter training for Oakland Unified School District teachers, staff and administrators at Cole Elementary School on February 16, 2018 in Oakland, California. Days after a gunman opened fire and killed 17 students at Marjory Stoneman Douglas High School in Parkland, Florida, teachers and staff with the Oakland Unified School District participated in an active shooter training that discussed strategies on how to deal with active shooter situations in schools. The training had already been scheduled prior to the Florida shooting. (Photo by Justin Sullivan/Getty Images)