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In fact, during their review of a month of operations, the GAO found some officers never referred a single passenger for a secondary screening.

Mr. Pistole said that, in part, because of behavior profiling, TSA is able to let more people go through expedited physical screening. Expedited screening still involves going through a metal detector and having luggage scanned, but it doesn’t put passengers through the more time-consuming full-body scans.

Mr. Pistole said someone with an underwear bomb or with a surgically implanted explosive could still get through the full screening, which is why the profiling program is still needed.