I recently flew with my daughter (domestically). She was randomly chosen for the extra screening. Pat down, swabs, check through her stuff etc. We were in a very small regional airport so it was kind of funny the way it all went down and everyone was very laid back about it.
They asked me if I gave permission for them to do so. Neither one of us really cared truth be told so permission granted. I only stipulated that I wanted a female to do the pat down, which was no issue.
What would they have done if I didn't give permission? Serious question. Could I honestly have withheld permission? I wouldn't have thought so. I meant to ask one of them but got sidetracked.