The backscatter machines (they are about 6.5 feet tall and you stand between two "walls" and hold your arms up) are the new normal scanning procedure in place of the old x-ray machines. They take a picture of your body (basically going through your clothes) where anything on the outside shows up. Sometimes they pat you down really quickly (might only be if they see something in the scan).
If you opt out of the new machines you can go through the old style x-ray machines, but then they do a more extensive pat-down on you, possibly with the x-ray wand thingy, and usually with their hands.
I am pretty sure if you set off the backscatter machine, you ALSO go through the other machine AND you get the more extensive pat down, too.




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