New Device "Lok Down" Aims to Lock Out Active Shooters in Schools
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Oxford High School parents say Nightlock door stops saved their kids' lives | WKEF
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School shooting fears prompt Michigan classroom barricade bill
Schools preparing for active shooters the wrong way, experts say - ABC News
Why Security Professionals Oppose Classroom Door Barricades
Active Shooter Door Locking Devices
Classroom Door Barricade Device to Prevent Active Shooter - YouTube
Block classroom door with chair amid Texas school shooting
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Meridian school employee invents device to make classrooms safer | ktvb.com
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