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Figures released by the TSA in America show that in 2002 American screeners missed 70 percent of knives and 60 percent of false explosives sent through X-ray machines by testers.Improvement is slow. NBC News reported last year that federal agents smuggled materials needed to make homemade bombs through security checks at 21 airports. Six months ago, the Newark Star-Ledger reported that 20 out of 22 weapons got by screeners at Newark's Liberty International Airport.