As for metal detectors, a school shooter in Minnesota killed the guard at the entryway of the metal detector in 2005 and another shooter killed and injured children on a playground rather than entering the school in 1989. In 1998, two students pulled the fire alarm and shot students as they exited the ...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://dailysignal.com/2018/02/27/schools-safer-now-than-they-were-in-90s-according-to-new-study/&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNEMHWwb9UvaQlfbtztB0CWJYbg6-g
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