Experts appear divided over Israeli-style behavioral detection efforts at U.S. airports. "The most practical thing is to look at things instead of people," says Rusty Rook of the University of Chicago, arguing that the size of the U.S. aviation system makes it difficult to import the Israeli model. But Rafi Ron, the former security director at Israel's Ben Gurion International Airport, says using security officers trained to spot suspicious behavior is the best way to stop terrorists. "We focus on people rather than on things," says Ron, who now heads a security consulting firm in Dallas.

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