Jeffrey Goldberg at The Atlantic has published a piece on his experience opting-out of the back-scatter body scanners at Baltimore-Washington International:
At BWI, I told the officer who directed me to the back-scatter that I preferred a pat-down. I did this in order to see how effective the manual search would be. When I made this request, a number of TSA officers, to my surprise, began laughing. I asked why. One of them — the one who would eventually conduct my pat-down — said that the rules were changing shortly, and that I would soon understand why the back-scatter was preferable to the manual search. I asked him if the new guidelines included a cavity search. “No way. You think Congress would allow that?”
I answered, “If you’re a terrorist, you’re going to hide your weapons in your anus or your vagina.” He blushed when I said “vagina.”
“Yes, but starting tomorrow, we’re going to start searching your crotchal area” — this is the word he used, “crotchal” — and you’re not going to like it.”
“What am I not going to like?” I asked.