I hate airport "security"... not because it is so annoying to pass through it, but because it is so ineffective.
Schneier and I joined the line with our ersatz boarding passes. “Technically we could get arrested for this,” he said, but we judged the risk to be acceptable. We handed our boarding passes and IDs to the security officer, who inspected our driver’s licenses through a loupe, one of those magnifying-glass devices jewelers use for minute examinations of fine detail. This was the moment of maximum peril, not because the boarding passes were flawed, but because the TSA now trains its officers in the science of behavior detection. The SPOT program—“Screening of Passengers by Observation Techniques”—was based in part on the work of a psychologist who believes that involuntary facial-muscle movements, including the most fleeting “micro-expressions,” can betray lying or criminality. The training program for behavior-detection officers is one week long. Our facial muscles did not cooperate with the SPOT program, apparently, because the officer chicken-scratched onto our boarding passes what might have been his signature, or the number 4, or the letter y. We took our shoes off and placed our laptops in bins. Schneier took from his bag a 12-ounce container labeled “saline solution.”
“It’s allowed,” he said. Medical supplies, such as saline solution for contact-lens cleaning, don’t fall under the TSA’s three-ounce rule.
“What’s allowed?” I asked. “Saline solution, or bottles labeled saline solution?”
“Bottles labeled saline solution. They won’t check what’s in it, trust me.”
They did not check. As we gathered our belongings, Schneier held up the bottle and said to the nearest security officer, “This is okay, right?” “Yep,” the officer said. “Just have to put it in the tray.”
I'm always the most nervous when I'm waiting in the security line, because that's the softest target in the whole transportation chain.