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Travelers wait for screening at a special TSA Pre-check lane at Terminal C of the LaGuardia Airport on January 27, 2014 in New York City. Once approved for the program, travelers can use special expidited Precheck security lanes. They can also leave on their shoes, light outerwear and belt, as well as keep their laptop and small containers of liquids inside carry-on luggage during security screening. The TSA plans to open more than 300 application centers across the country. (Photo by John Moore/Getty Images)
Travelers wait for screening at a special TSA Pre-check lane at Terminal C of the LaGuardia Airport on January 27, 2014 in New York City. Once approved for the program, travelers can use special expidited Precheck security lanes. They can also leave on their shoes, light outerwear and belt, as well as keep their laptop and small containers of liquids inside carry-on luggage during security screening. The TSA plans to open more than 300 application centers across the country. (Photo by John Moore/Getty Images)

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GAO: TSA screenings may not be effective

The Government Accountability Office evaluates TSA security measures on Capitol Hill. CNN's Rene Marsh reports.

GAO: TSA screenings may not be effective

The Government Accountability Office evaluates TSA security measures on Capitol Hill. CNN's Rene Marsh reports.