I travel a lot, 80+ segments per year, and this is a first for me. I walked through the WTMD and was randomly chosen for a hand swab. A screener with and ETD wand rubbed the swab over the palms and fingertips of both hands and them did an ETD on the swab. I passed. This seems to be an efficient way to actually find people that have been handling explosives. The only negative of which I can think are that there are a significant number of people that handle ETD suspicious chemicals and would require a thorough scrubbing before the airport. If they have had the handle on their carry on to alarm, they probably already do this. And, maybe that it slows the line a bit. If I am wrong, this is the crowd that will let me know.