Over the past few months, coverage of mass shootings at Umpqua Community College in Roseburg, Oregon, and the Inland Regional Center in San Bernardino, California, has gripped the country and shone a national spotlight on what law enforcement calls “active shooter incidents.” According to a report released by the FBI, the most likely places for an active shooter incident to occur are commercial businesses, a fact that has many employers worried about the safety of their employees and customers.