Originally Posted by WillCAD

Well, that's pretty obvious - if you are selected for an AIT scan, whether by alarming the WTMD or by random chance or because a TSO is having a bad day and takes issue with your hair, eye, or skin color or accent or the fact that you're wearing a watch worth more than he makes in a month, you can either take the AIT scan, or you can opt out and get a full body rubdown with genital contact, coupled with a complete bag search where all of your items are removed and individually swabbed for an ETD test.