Security measures often are classified along the five steps of the security continuum: deter, detect, delay, respond and recover. With an active shooter, if schools wait until the response step (typically when law enforcement responds to a 911 call), loss of life is likely. Often, a first responder is a few minutes away when seconds count.
Greater focus needs to be placed on the first three steps: deter, detect and delay; the goal is preventing the incident in the first place and eliminating the need for a response.
Read more in the full article published by American School & University.