TSA’s Secret Behavior Checklist to Spot Terrorists (Don't yawn) [View all]
The checklist is part of TSAs controversial program to identify potential terrorists based on behaviors that it thinks indicate stress or deception known as the Screening of Passengers by Observation Techniques, or SPOT. The program employs specially trained officers, known as Behavior Detection Officers, to watch and interact with passengers going through screening.
The document listing the criteria, known as the Spot Referral Report, is not classified, but it has been closely held by TSA and has not been previously released. A copy was provided to The Intercept by a source concerned about the quality of the program.
The checklist ranges from the mind-numbingly obvious, like appears to be in disguise, which is worth three points, to the downright dubious, like a bobbing Adams apple. Many indicators, like trembling and arriving late for flight, appear to confirm allegations that the program picks out signs and emotions that are common to many people who fly.

More at link
https://firstlook.org/theintercept/2015/03/27/revealed-tsas-closely-held-behavior-checklist-spot-terrorists/