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  • Under lock-down, classroom doors are secured and either a green card, signifying that everyone inside is safe, or a red card, signaling a threat, an injury, or other problem, is slid under the door into the hallway. ???No card under the door is the same as a red card,??? Wegener explains.???The idea is to expedite the first response, bypassing the ???safe??? rooms initially and moving quickly to w
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