Since the 1999 Columbine High School shooting, a generation of American children has learned how to hide from a potential shooter. But there's little data on ...
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Columbine Anniversary: How Effective Are School Lockdown Drills? NPR
from Top stories - Google News https://n.pr/2PjIJ4j
from Top stories - Google News https://n.pr/2PjIJ4j
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