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School Public Address Systems Are Critical During an Active Lethal Threat Event - Campus Safety Magazine
https://www.campussafetymagazine.com/news/school-public-address-systems-are-critical-during-an-active-lethal-threat-event-2/158424/
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School Public Address Systems Are Critical During an Active Lethal Threat Event, PA systems, intercoms, active shooter, Jesus M Villahermosa Jr.
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