Forgive me if this has been posted and/or discussed in the last few days, but I couldn't find anything.
With all the hoo-ha in England and america at the moment, I was reminded that every time I flew out of airports in Japan in the last few years (int'l and domestic) that security staff asked pax to hand over plastic bottles to test their contents on some sort of machine. They just put the bottle on the machine, press a button and within seconds hand the bottle back once the contents have been safely identified.
Questions: What do these machines do? Are they used anywhere outside of Japan? How effective are they in testing for inflamable or explosive liquids?