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CHICAGO, IL - JUNE 02:  A sign directs travelers to a security checkpoint staffed by Transportation Security Administration (TSA) workers at O'Hare Airport on June 2, 2015 in Chicago, Illinois. The Department of Homeland Security said that the acting head of the TSA would be replaced following a report that airport screeners failed to detect explosives and weapons in nearly all of the tests that an undercover team conducted at airports around the country.  (Photo by Scott Olson/Getty Images)
CHICAGO, IL - JUNE 02:  A sign directs travelers to a security checkpoint staffed by Transportation Security Administration (TSA) workers at O'Hare Airport on June 2, 2015 in Chicago, Illinois. The Department of Homeland Security said that the acting head of the TSA would be replaced following a report that airport screeners failed to detect explosives and weapons in nearly all of the tests that an undercover team conducted at airports around the country.  (Photo by Scott Olson/Getty Images)

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    Video puts TSA practices under scrutiny

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Video puts TSA practices under scrutiny

A video posted online shows a 10-year-old girl receiving a pat-down from a TSA agent.

Video puts TSA practices under scrutiny

A video posted online shows a 10-year-old girl receiving a pat-down from a TSA agent.