Locked doors save lives. Multiple after-incident and commission reports consistently show that locked classroom doors slow attackers and prevent entry. In past tragic events, shooters have not breached locked classroom doors—they move on to find an easier point of access. Every secured door creates a critical delay, giving students and staff precious seconds and allowing emergency responders more time to arrive and stop the threat.

Below are links to official after-action reports demonstrating the proven effectiveness of secured, locked doors in active shooter incidents.