The program, called SPOT, was created in 2006 by the Transportation Security Administration (TSA), and now has more than 3,000 “Behavior Detection” officers at 161 airports. The officers receive four days of classroom instruction on how to spot certain unusual behaviors.

But the Government Accountability Office says the TSA has relied on unproven behavioral science and Congressional critics say the program has done nothing to deal with the actual vulnerabilities of airport security…

“Every airport in the world, including every airport in the United States, has virtually no security until you get to the security checkpoint,” said Richard Clarke, an ABC News consultant and former White House counter-terrorism official.

“Very large parts of all airports are inherently insecure.”