Where an elementary school shares a building with a middle or high school that uses scanners, the elementary school students use a separate entrance, according to the Education Department. The city first installed metal detectors in schools in 1988 and expanded their use starting in 1992, after a shooting at Thomas Jefferson High School in Brooklyn that left two students dead. Metal detectors were often added to schools after violent episodes, and once they have been put in place, it is rare for them to be removed. (The high school and the elementary school share an entrance.) Gregory Floyd, the president of Teamsters Local 237, which represents school safety agents, said he had been pushing for several years to install metal detectors in every high school.

Source: New York Times September 27, 2017 23:55 UTC