>In fact, if I were to drop my pants in the middle of the security line, I'd be arrested, but the TSA can drop my pants for me without recourse.

There is actually a hilarious idea buried here. An interesting way to protest full-body scans would be to walk through security naked to make the point about what is really happening in the machine. Done en masse, it could probably get some media attention. And to make it legal, you could probably just wear some minimal fleshtoned bits taped over the right parts, which is supposedly all the machine does to make it "legit" for TSA employees to watch.