Ok, so one in five bad guys get are flagged, then what? Good luck preventing them from flying because a machine gets a bad feeling about them.

What about false positives? That rate isn't even mentioned. This project would be in court so fast once innocents are flagged.

We're still very early on in this research, but it is looking very promising," says DHS science spokesman John Verrico. "We are running at about 78% accuracy on mal-intent detection, and 80% on deception."
http://techfragments.com/news/142/Tech/Futuristic_Security_Checkpoints_Know_What_You_Do_Before_You_Do_It.html