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The next generation of security screening systems will be based on so-called terahertz technology that can see weapons and explosives hidden under people's clothes. But using terahertz radiation to produce X-ray-like images of passengers is likely to be unacceptable for routine use, as it will allow security staff to see the people they are scanning as if they were naked.
Instead of producing images, it plans to build a detection system that picks up the telltale frequencies that explosives or metallic objects reflect and absorb when terahertz waves hit them.
Instead, the system will check to see which wavelengths of terahertz radiation have been absorbed and reflected by the subject and pick up the characteristic spectral signatures of explosives, metals and other chemicals such as drugs.
Originally posted by Damned
I'm still waiting to see the new terrorist detection wands. You just wave it over any terrorist, and it beeps. I'm sure they're in development.