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What airport security swabs really look for
HERE’S THE INTERESTING PART
When security agents inexplicably wipe your hands with a small pad and run it through a machine, they aren't checking for drugs. They are using an ion mobility spectrometer to detect microscopic residues of explosive materials like nitrates or glycerin. If you recently used certain heavy hand lotions or fertilizers, prepare for a highly uncomfortable interrogation.
One discovery leads to another.
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