The other thing I'd say is that in my experience (flying out of and watching others pass through Canadian screening) the randomizer mat yields very few positives--in other words, gojirasan, if you are doing this to avoid the scans you should be very happy with the results, but if you're doing it for the express purpose of opting out, you may be rescheduling your ticket pretty often. Your first post made it look like you wanted to opt out to make a point, but in your subsequent posts it appears that you just want to fly free from harassment, so I'm not clear what your ultimate goal is.