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In a Thursday, May 10, 2018 photo, Andrea Nester, risk manager for Natrona County School District, talks to school staff from various parts of the county during an ALICE training class in Casper, Wyoming. The mandatory training teaches staff how to react in the event of a school shooting. (Josh Galemore/The Casper Star-Tribune via AP)

In a Thursday, May 10, 2018 photo, Andrea Nester, risk manager for Natrona County School District, talks to school staff from various parts of the county during an ALICE training class in Casper, Wyoming. The mandatory training teaches staff how to react in the event of a school shooting. (Josh Galemore/The Casper Star-Tribune via AP)

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