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Calibrating the US airport safety net every morning

TSA officers' most crucial task is to test the equipment that roots out prohibited items that passengers may stash in luggage or tuck into clothing


ON an early Monday morning when few people were around, Virginia Sams slipped a gun-shaped object into her sock and walked through a metal detector. She took one step back and one step forward, a quick march over a battle line of sorts. The machine reacted angrily, with beeps