New remote sensing system can detect explosives and drugs 
Ever since the underwear bomber on a Northwest Airlines flight failed to ignite a powdery substance Christmas Eve, airport security regulations have been put into question.
When airport authorities claimed high-tech security scanners could have prevented this from ever happening, the scanning devices that used terahertz (THz) technology attracted some eyeballs.
A number of the new body scanning machines have been deployed in major airports in the United States. However, privacy advocates worry the see-through-your-clothes scanning machines reveal way too much.
