A federal review concludes there is no solid evidence that airport checkpoint personnel have a clue when they scan the approaching line for suspicious passengers.
In a report to be presented to a House of Representatives subcommittee Thursday, the Government Accountability Office says there is no evidence that it is effective for Transportation Security Administration officers to scan the crowd for telltale signs someone might be a terrorist.
Critics have suggested that the stress and exhaustion that often accompany air travel are too easily misread as suspicious behavior.