“The issue of school shootings is obviously a very emotional debate,” he said. “What we are trying to do is take the emotion out of the debate and figure out how we can save the most lives and educate the policy makers, as well as parents and citizens.

In the scenario where there is an armed resource officer, casualties dropped by 66.5 percent and response time was cut 59.5 percent. When five percent of teachers were carrying concealed weapons, deaths were reduced by 6.8 percent and response time dropped by 5.4 percent. When 10 percent of teachers were carrying concealed weapons, casualties fell by 23.2 percent and response time went down 16.8 percent.

However, the real reductions came when teachers carrying concealed firearms were supplemented with a resource officer, the results show.

In the scenario where five percent of teachers were carrying concealed guns and a resource officer was present, casualties dropped an astonishing 69.2 percent and response time dropped 59.7 percent. Finally, when 10 percent of teachers were carrying concealed firearms and a resource officer was present, casualties fell by 70.2 percent and response time was reduced by 62.7 percent.