The violence witnessed last year at Columbine High School has led school leaders to plan for a worst-case scenario in their own schools: a "code red" situation, in which armed criminals are loose in the building. As unimaginable as it may seem, such a scenario has happened before, and no one can guarantee that it won't happen again.

Over the last 20 years, many schools have begun the process of modernizing their doors and locksets to meet...

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