These are the clear, cylindrical scanners using millimeter wave technology and sold by L-3 Communications.

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Lee of TSA emphasized that the images Coney refers to do not represent millimeter wave technology but rather "backscatter" technology, which she said TSA is not using at this time.

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Using millimeter wave technology, which the TSA says emits 10, 000 times less radio frequency than a cell phone, the machine scans a traveler and a robotic image is generated that allows security personnel to detect potential threats -- and, some fear, more -- beneath a person's clothes.

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The other uses millimeter-wave technology, which shows a detailed photo negative.

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Would any of us have objected to the deployment of millimeter-wave scanners had the technology been available then?

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