Fallen Andy points out an article in The Atlantic written by Jeffrey Goldberg. He and Bruce Schneier teamed up to put the TSA's policies to the test
at the Minneapolis-St. Paul International Airport. They found plenty of evidence for security theater, and rather less for actual security. Quoting:
"'The whole system is designed to catch stupid terrorists,' Schneier told me. ... As I stood in the bathroom, ripping up boarding passes, waiting for the social network of male bathroom users to report my suspicious behavior, I decided to make myself as nervous as possible. I would try to pass through security with no ID, a fake boarding pass, and an Osama bin Laden T-shirt under my coat. I splashed water on my face to mimic sweat, put on a coat (it was a summer day), hid my driver's license, and approached security with a bogus boarding pass that Schneier had made for me. ... 'All right, you can go,' [an airport security supervisor] said, pointing me to the X-ray line. 'But let this be a lesson for you.'"