For decades, campus security strategies focused on keeping threats outside school walls. But since the tragedy at Columbine High School, data has shown that many attacks begin inside the building, often in classrooms and corridors. This shift has prompted schools to rethink security from the inside and place greater emphasis on interior elements such as classroom doors. This shift is evidenced by a new generation of classroom door systems engineered to delay inside intruders and an ASTM standard that raises the bar on how these systems must be designed to defend against attack.
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