Originally Posted by
Superguy
I think free in this case should be used loosely. You're free to refuse the answer, and the TSO will be "free" to deny entrance to the sterile area. Thus the way that TSA is making it out with the cash, they're practically conditioning entry into the sterile area upon waiving your 5th amendment rights if asked.
PTravel can feel free to correct me if I'm wrong and I won't take offense.

No, I agree with you. That's why, if a TSO denied me entrance to the sterile area for refusing to answer something like, "Why are you going to Montana?", I get the GSC and let him or her sort it out. Though, I imagine, just the mere fact that I was going to Montana would probably call my mental stability into question.