This March, Florida state legislators passed a law that allows local sheriff’s departments to train school faculty to carry concealed weapons on campus, a measure President Donald Trump has repeatedly supported. The arrangement is formally known as the Coach Aaron Feis Guardian Program, which was named in honor of the football coach who died while protecting students against an active shooter at Marjory Stoneman Douglas High School.

High profile school shootings in recent years have offered enterprising insurance companies with a business opportunity - and burdened districts budgets with thousands of dollars in new expenses.