There are still four layers of security: presentation of valid government ID, boarding pass, x-ray inspection of carryon luggage, and passing through a magnetometer for the presence of metal.

FORBES: For Some Fliers TSA Security Lines Just Got Much Shorter

"In the case of Corporal Millington, the donor had a chest X-ray, broncoscopy and a careful inspection of the lungs once they were removed, " Watson told CNN.

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