And should we drive, do I assume we also have - by choosing to drive - agreed to the various police stops, roadblocks, and backscatter X-ray scans of vehicles?
Oh, you've got choices other than flying if you don't want to be put through such measures. There's always the train for instance, oh never mind, they're starting to screen there to. Well I suppose you could take the bus. Drat, almost forgot, they're testing out a screening program that as well. Hmm. Your car? You already mentioned "sobriety and seatbelt" checkpoints and vehicle mounted x-ray devices. Looks like your only choice is either walking or biking to see your friends two states away, but be sure to stay off the interstate and certain highways where that method of travel is forbidden. Mind you that still doesn't resolve the issue of being randomly x-ray'd without consent while traveling on the public thoroughfare. I could name a few countries that included the restriction of travel in their toolbag of control over their people, and surprisingly, it wouldn't even godwin the thread.
I have a serious question on a related note. Do we have anyone here who's profession is in health care? I don't remember from the few times I've been x-ray'd at the doctors office, considering I intentionally went there to get said x-rays; is consent of the patient or guardian/legal rep required prior? I'm curious if this falls under the category of a medical procedure requiring consent, and if so, what differentiates the cops and others using drive by x-rays on people without consent.