Even if the TSA carries through on its plan to install 300 new full-body scanners in airports throughout the U.S., about 500 checkpoints will still rely on older technology, according to aviation experts. "It's just too easy for a terrorist to know where the technology is fielded and where it's not and to make modifications accordingly," says Richard Bloom, who heads security studies at Embry-Riddle Aeronautical University. Meanwhile, a former Homeland Security Department inspector general says the whole system is undermined when passengers can simply opt out of body scans in favor of a pat-down. "There is a limit to how far screeners will go looking underneath someone's bra or digging around someone's crotch," says Clark Ervin, who wants to see scanners "at every airport and every checkpoint."

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