Airport security teams are screening passengers' faces, not just their bags. TSA officials say terrorists and other lawbreakers cue trained observers by exhibiting certain behaviors that traditional screens don't look for. "In this kind of environment, you can't be sure they are going to come to the checkpoint with a prohibited item, per se," said TSA administrator Kip Hawley. "Unless you do something more than that, you are going to miss the next attack. A behavior-detection officer will detect somebody no matter what the weapon is."

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