Times Square bombing suspect Faisal Shahzad was arrested after he boarded a plane headed for Dubai, though the government is spending millions each year on a program that's supposed to spot terrorists before they reach the gate.
As CBS News chief investigative correspondent Armen Keteyian reports, the program doesn't seem to be working.
There's a hidden layer of airport security most people don't know about.
It's called "behavior detection," and involves specially trained Transportation Security Administration employees whose primary mission is to spot terrorists.
They look for unique facial expressions and body language that may identify a potential threat. About 3,000 of these officers work at 161 U.S. airports -- costing taxpayers nearly $200 million in 2009. This year, the TSA asked Congress for $20 million more to expand the program.