Lifting Their Heads Their arms about the sensors scan the body for about three seconds .
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The sensors detect part of the electromagnetic spectrum That Emits energy from the body at wavelengths of one Millimetre.
Because the energy from a human body is radiated at a higher rate than plastic, metal and ceramic, the unit can then reveal those objects.
The scan blurs out the face of the passenger, and the image is not stored.
However, the American Civil Liberties Union said the body scanning technology could be too intrusive as it could project images of mastectomies and catheter tubes.
The Transportation and Security Administration has placed the scanners in airports in Salt Lake City, Las Vegas, Miami, San Fransisco, Tulsa, Okla and Albuquerque, in a pilot program.
It is currently a voluntary system.
There are no plans to bring the scanners to the UK at this time.
A Spokesman for the TSA Said the new scanners Were Better for travelers with hip or knee replacements, as They Are Currently patted down if Their prosthetic sets off a security alarm.
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