TSA takes explosives screening to fliers
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The microwave-oven-size detectors are usually stationary and are a common sight at airport checkpoints, where screeners swipe a small swab along a bag or a passenger's hand. The swab is then run through a reader that can detect minute amounts of explosives.
The machines are so sensitive that alarms can sound for passengers who have recently taken heart pills containing nitroglycerin, or if they have recently fired guns, Jenkins said. The machines also are used on checked luggage.
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