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How to Survive a Mass Shooting

When an active shooter enters your workplace, there are three words to know -- and practice.
07:16 | 04/27/2013

Transcript for How to Survive a Mass Shooting

It's not just going postal anymore. Identities going crazy, with a gun, in almost any workplace. So, how can you defend yourself? I found out on a tour through our very own "20/20" offices. But a... See More
This transcript has been automatically generated and may not be 100% accurate.
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