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MARTIN BASHIR (ABC NEWS) (Off-camera) Good evening. Tonight, we focus on what may prove to be a major breakthrough in homeland security. But it doesn't involve technology or any other kind of x-ray device. Instead, this is about so-called behavior profiling. That is the ability of airport security to see something in the way you behave that indicates a malicious intent. So what secrets lie in a furrowed brow or a nervous laugh? I went to one of America's busiest airports to find out. [ABSTRACT FROM PUBLISHER]