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The TSA has claimed in press releases and on its Web site that images cannot be stored on the machines, which which can see beneath people's clothing. The administration has also stated that the machines are incapable of sending images.
A TSA official told CNN the storing and sending functions are turned off before the scanners are delivered, and that airport screeners cannot put the machines into test mode to turn the functions on.
The administration also said scanners cannot be hacked from the outside because they are not networked.
A recent survey found most Americans support installing the full-body scanners, despite concerns raised by privacy advocates. The USA Today/Gallup poll conducted Jan. 5-6 says 78 percent of Americans approve of their use.
About 40 machines are already in use at 19 airports, and the TSA says will install 150 more nationwide this year, according to CNN.
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