Coming soon to an airport near you. http://www.technologyreview.com/blog/arxiv/24331/ Here's some background as to why this matters: http://www.popsci.com/category/tags/terahertz-scanners
These are also known as strip search scanners. From what I've read, they will become common within a few years.
It has all gone to shit. Christmas was sept 3l3v3n all over again. In Dubai, there was a man that was arrested when passing through new airport security systems that sniffed like one microgram of cannabis on a man's shoe. I thought then, "this is why I wouldn't want to visit the UAE, they are tyrannical and draconian" The next few years we will see the world turn into a frightening sci-fi movie.