It would be pornography. You think I'm kidding? Take a look at that body scan. You can see the nipples and aureolas clearly defined. You can see the area of her pubic hair. Just because it's a "scan" doesn't mean it's right.
And here's my bigger problem with it - it still won't stop the people who are determined to blow up planes or harm Americans. Because it can't see inside the body. Hell, as my dear wife pointed out, you can't even see if she's wearing a bra or not. How much effort does it take to put whatever explosives you want into a bra, or into a vial that's inserted into the rectum or *ahem* other bodily orifices?
Desperate people will be infinitely creative. And as long as you focus on objects rather than on the people themselves, someone will find a way to beat your system.
By the way, who else want's their body scan to be kept on file by the feds? Because they're doing just that. The link is at the Geek's place. Enjoy!