"Back in the good ol' days, we use to be able to opt out of full body scans." OK, so no one is saying those exact words, but the TSA did just change their rules on body scanning -- just in time for the holidays.
According to updated TSA guidelines, airport security is within its rights to force travelers to walk through those body scanners even if they opt out. Before, you could choose to have a pat down (why would you choose a pat down?). So if you're scared of the radiation, well, get over it. Updated rules read as follows:
"While passengers may generally decline AIT screening in favor of physical screening, TSA may direct mandatory AIT screening for some passengers. TSA does not store any personally identifiable information from AIT screening."