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Vanity Fair meets up with security expert and prominent TSA critic Bruce Schneier, at Ronald Reagan airport in Washington, DC.

As we came by the checkpoint line, Schneier described one of these aspects: the ease with which people can pass through airport security with fake boarding passes. First, scan an old boarding pass, he said—more loudly than necessary, it seemed to me. Alter it with Photoshop, then print the result with a laser printer. In his hand was an example, complete with the little squiggle the T.S.A. agent had drawn on it to indicate that it had been checked. “Feeling safer?” he asked.

I haven’t traveled to the US in a while, but wouldn’t the barcode on the boarding pass scan incorrectly? Or don’t they check that?