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This May 29, 2008, photo shows a bullet-resistant lock installed by NetTalon Security Systems on the door of a classroom at McKinley Middle Magnet School in Baton Rouge, La. The company has struggled to sell versions of the comprehensive security package it installed at the school. (Richard Alan Hannon/The Advocate via AP)

This May 29, 2008, photo shows a bullet-resistant lock installed by NetTalon Security Systems on the door of a classroom at McKinley Middle Magnet School in Baton Rouge, La. The company has struggled to sell versions of the comprehensive security package it installed at the school. (Richard Alan Hannon/The Advocate via AP)

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