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Home School prepares for shooters School Shooting Detector

School Shooting Detector

Officers from the Methuen, Mass., police department carry training weapons as they search the halls of a school during a demonstration in Methuen, Tuesday, Nov. 11, 2014. School and police officials have unveiled a new system to detect and track a gunman that they say is the first in operation in a public school. (AP Photo/Charles Krupa)