Not theoretically impossible

BBC NEWS | Technology | Camera ‘looks’ through clothing:

Unlike current security systems that use X-rays, the ThruVision system exploits terahertz rays, or T-rays. This electromagnetic radiation is a form of low level energy emitted by all people and objects. These are able to pass through clothing, paper, ceramics and wood but are blocked by metal and water. The system works by collecting these waves and processing them to form an image which can reveal concealed objects. “If I were to look at you in terahertz you would appear to glow like a light bulb and different objects glow less brightly or more brightly,” said the firm’s spokesperson. “You see a silhouette of the form but you don’t see surface anatomical effects.”

And I do kinda like the idea that it doesn’t use ionizing radiation to get through clothes. I’m sure that someone will start figuring out countermeasures, but it’s a start. Oh, and don’t let the camera look at you in profile.

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