COMING UP: CBS4 Investigates Inside Denver's Underground, Tonight on CBS4 at 10 (Watch Preview)
'Standard Response Protocol' Created After Platte Canyon School TragedyThe actions of "lock out, lock down, evacuate and shelter" is now language for students and staff when a crisis happens in schools. It's used in some of the largest school districts in Colorado and in more than 5,000 districts nationwide.

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