The TSA is working to put full body visual scanners that see through clothes in the world’s airports. But a British newspaper says what I had thought myself, that they will just see through low-density chemicals such as those used by the Underwear Bomber:
Since the attack was foiled, body-scanners, using "millimetre-wave" technology and revealing a naked image of a passenger, have been touted as a solution to the problem of detecting explosive devices that are not picked up by traditional metal detectors – such as those containing liquids, chemicals or plastic explosive.
But Ben Wallace, the Conservative MP, who was formerly involved in a project by a leading British defence research firm to develop the scanners for airport use, said trials had shown that such low-density materials went undetected.