Coming to an airport near you: Behavior Detection Officers, trained by the Transportation Security Agency (TSA) to spot "suspicious people."

One of the techniques they'll be using is the Facial Action Coding System (FACS). They're taught, for example, that potentially dangerous people could have lowered eyebrows with a vertical furrow between, or raised eyebrows with a wrinkled forehead.

Just a warning. Be careful. And watch your face.