Transportation Security Inspector Cara Ropp and Nestle check out passengers at the Detroit Metropolitan Airport, Thursday, Feb. 19, 2015, in Romulus, Mich. The TSA showed off Nestle who is being used to detect explosives and explosive components at the airport. The passenger screening canines, or PSCs, are being used to identify and locate potential explosive threats at security checkpoints. (AP Photo/Carlos Osorio)
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