They’ve got one at BWI. It was only being used for one of the lines, and after I saw what it was, I jumped into the other line with the regular metal detector, while the other people simply went in like sheep to the slaughter, thinking nothing of it.
Public nudity is only safe in heaven.
I did the same thing at BWI two weeks ago Tuesday (twice that day, first flight was cancelled so back to the check-in area). Just dropped off my stuff on the belt, walked past the body scanner line and through the metal detector.