A camera that can "see" explosives, drugs and weapons hidden under clothing from 25 metres has been invented. The ThruVision system could be deployed at airports, railway stations or other public spaces. It is based on so-called "terahertz", or T-ray, technology,
normally used by astronomers to study dying stars...
http://news.bbc.co.uk/2/hi/technology/7287135.stm