Thanks for your efforts to educate them, but it's true about "many more to go." The Australian airport model is certainly based on "as soon as you've finished with one victim, pick the next person who comes through."

In one* airport I use a smaller checkpoint where I know that I won't set off the WTMD with my metal hip, but there's usually only a few other passengers there. I'm getting very good at adjusting the rate of repacking my laptop bag, while watching the ETD person in my peripheral vision, to let someone else get "randomly" selected for the swab.

At another* airport, though, I always get caught by the WTMD, get the grope, and the ETD station is harder to see while repacking, so I always get swabbed as well. The last time (just after Australia raised its security alert ) I had a particularly unfriendly groper and then the ETD woman waved me over. And there was none of that "do you mind?" or "have you done this before?" or "here a laminated sheet of paper" - just a rude "come over here, I need to check your bags." I rolled my eyes and said "this isn't really random if I get chosen every time" and she said "you don't have to do this; you can go back out the way you came in." Then while swabbing, she informed me that "this is an airport, you know."

*I'm not going to identify airports 'cause I don't want them changing the WTMD settings or anything.