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Massachusetts school installs country’s first shooter-detection system

One district in Massachusetts this week unveiled the country's first installation of a shooter-detection system inside a U.S. school.

Lt. Greg Gallant, of the Methuen, Mass. police department, portrays an active shooter as he roams the halls of a school with an assault rifle, loaded with dummy rounds, during a demonstration in Methuen, Mass., on Nov. 11, 2014.AP

Michele Richinick