Students waiting in another line, this time to walk through a metal detector and to put their belongings and backpacks through an X-ray machine like you would at an airport. Uniformed security guards monitored each student passing through the detector, some students being searched with a metal ...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://highlandscurrent.com/2018/02/04/haldanes-paper-the-blue-print/&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNEHQS7RZXtGJRxDNdgQEkQBs0CRkQ
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