One-by-one, the students walked through a portable metal detector that had been set up a few minutes before the random check. It beeped as one student walked through, and one of the safety members further investigated with a hand-held wand. A zipper on the student's shoes had caused the alarm, ...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://www.indeonline.com/news/20180302/metal-detectors-aid-in-keeping-schools-safe&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNHpUnTrhv35NTnNIoQhy6y1pQSd-Q
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