About a dozen high-tech detectors will be positioned at subway entrances where officers conduct random bag searches.
Instead of searching by hand, the officers will swab the outside of bags. The detectors can analyze the swabs for traces of explosives within a few seconds.
One of the devices can detect evidence both of traditional explosives like TNT and of homemade fertilizer bombs. The department paid between $25,000 and $50,000 for each detector.
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