Hmmm ... anyone for some passive resistence?

I think we need to start a public education campaign that encourages everyone to bunch up their socks before entering the machine. That's a pretty powerful statement about the quality of the scanner's results ... something everyone should be able to understand.

that's useless. all you are proving is that it can have false positives, which everyone already knows and rightly doesn't care about.

you would need to prove that it has numerous false negatives, without being arrested.

If you want to change policy, there are two routes you can go I think. Proving false negatives is one way, since it proves them worthless, but making false positives skyrocket could be another method. If they simply become an unworkable solution people will call for change just as well.