School Safety Research : The Real Vulnerability in School Shootings
- William DeMuth
- 6 hours ago
- 2 min read
A landmark analysis of 54 attacks at K-12 schools reveals that most attackers walked through open exterior doors, and that unsecured entry points triple the casualty count.
When school shootings make headlines, the public debate often centers on gun legislation, mental health infrastructure, or police response times. What rarely surfaces is a simpler, more immediate variable: whether the front door was locked.
A comprehensive study by ALERRT (Advanced Law Enforcement Rapid Response Training) in partnership with the Security Industry Association analyzed 54 active assailant attacks at K-12 schools across the United States, examining a single overlooked dimension: door security. What they found challenges conventional assumptions about where and how school violence occurs.
"The issue is not lock failure. The issue is failure to secure and control access points before violence begins."
High schools represent the largest share of attacks, more than half the incidents studied, followed by elementary and middle schools. Researchers tracked 66 distinct door interactions across the 54 perpetrators, building a granular picture of how attackers navigate school entry points.
Key findings on door security
66 door interactions were recorded across 54 perpetrators, meaning many attackers tested or engaged multiple entry points.
Glass was the primary breach point: mechanical breach through glass occurred in 6 of 9 forced-entry attempts, making aluminum-frame exterior doors with glass panels the most vulnerable door type.
No locks were mechanically defeated. Not a single attacker picked, bypassed, or broke a lock mechanism. Every locked door held.
61.7% of doors were unlocked or propped open at the time of the attack, providing zero physical barrier.
Most attackers simply walked in through unlocked exterior doors. No force, no tools, no confrontation.
3× More casualties at unsecured locations | 61.7% Doors unlocked during the attack | 31% Lockdowns initiated after attack ended | 6 / 9 Glass breach attempts succeeded |
Perhaps the most striking finding: locations with unsecured doors experienced three times the number of casualties compared to those where access was controlled. This single variable, whether an exterior door was locked, had a larger impact on outcomes than almost any other factor studied.
Compounding the problem is a response-timing failure. In 31% of cases, lockdown procedures were only initiated after the attack had already concluded, meaning emergency protocols offered no protective value whatsoever during the actual event.
The big takeaway: This research does not indict any particular security technology or policy. What it does make clear is that passive access control, ensuring exterior doors are locked before an incident, remains the single most effective and underutilized intervention. Schools that control their perimeter before violence starts save lives. Those that rely on reactive lockdowns after entry has already been gained do not.
For school administrators and safety planners, the implications are direct: routine door audits, anti-propping protocols, and access-point monitoring are not supplementary security measures. Given this data, they may be the most consequential ones available.
