This article explains why I saw a machine at BKK before (not being used). Also that they are using MMW. However, if the airport authority thinks this is going to speed things up, they are kidding themselves. The Thais need to talk to the Germans, who tested out these things and said "No way." And there are still privacy concerns and (among some of us still) safety concerns.

Given ThisIsThailand, I'm sure with these machines there's a money trail to be followed somewhere...