So we don't have rights unless the Constitution gives them to us? Interesting.
Privacy should be held as a basic human right because otherwise the entirety of modern society collapses. Now, when you willingly enter someone's property and something like that scanner is a condition of entry it's not an invasion of privacy because you're doing it voluntarily.
But this interpretation that our rights are LIMITED to what's in the Constitution is fucking absurd and outright dangerous. Yeah, you might not object to having your car searched or your background checked because you don't do anything wrong - but privacy goes far beyond that. Without privacy, literally every part of modern society collapses.
Confusing 'invasion of privacy' with 'voluntary acceptance of another person's conditions for entering their property' is a no-no. But be very fucking careful when you start trying to limit people's rights - you don't have any idea what the implications of that will be, and people like you feeling that privacy doesn't exist is a big part of what brings about the clusterfuck that is today's American politics.
Jeff