Airport security: Intent to deceive?

In August 2009, Nicholas George, a 22-year-old student at Pomona College in Claremont, California, was going through a checkpoint at Philadelphia International Airport when he was pulled aside for questioning. As the Transportation Security Administration (TSA) employees searched his hand luggage, they chatted with him about innocuous subjects, such as whether he'd watched a recent game.

Inside George's bag, however, the screeners found flash cards with Arabic words — he was studying Arabic at Pomona — and a book they considered to be critical of US foreign policy. That led to more questioning, this time by a TSA supervisor, about George's views on the terrorist attacks on 11 September 2001. Eventually, and seemingly without cause, he was handcuffed by Philadelphia police, detained for four hours, and questioned by Federal Bureau of Investigation agents before being released without charge.

George had been singled out by behaviour-detection officers: TSA screeners trained to pick out suspicious or anomalous behaviour in passengers. There are about 3,000 of these officers working at some 161 airports across the United States, all part of a four-year-old programme called Screening Passengers by Observation Technique (SPOT), which is designed to identify people who could pose a threat to airline passengers.