Violence and other crime erode the quality of K-12 education because students who don’t feel safe can’t learn well and teachers who feel threatened don’t teach confidently. School administrators have begun to fight back against violence with security technology such as electronic access control, video cameras, communications systems, metal detectors, and X-ray machines.
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[source: http://www.buildings.com/ArticleDetails/tabid/3334/ArticleID/14630/Default.aspx]
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