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Out of Tragedy, a Protective Glass for Schools –

In the two years since the Sandy Hook Elementary School shooting in Newtown, Conn., schools across the country have become more serious about safety.

They have bought familiar items like surveillance cameras, panic buttons and key-card entry systems. More recent innovations include bulletproof whiteboards to help teachers shield students inside classrooms and a smartphone app that starts a school lockdown with the swipe of a finger.

By 2017, the market for school security systems is expected to hit $4.9 billion, up from $2.7 billion in 2012, according to the market research firm IHS Technology.