Tim Leon, director of safety and security for Mesa County Valley School District 51 , works with school resource officers to secure external school doors during a lockdown drill at Broadway Elementary School in Grand Junction March 28, 2019. The district has nine full-time security officers and contracts with local law enforcement for another 15 officers. (William Woody, Special to The Colorado Sun)

As the 20th anniversary of the Columbine High School shooting approaches, the Colorado Sun investigates the world of school safety in a multi-part series, After Columbine. To read the latest, click here.

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