I also go through the trusted traveler line, and the rules there are _usually_ different (but not always!) and I definitely don't recall seeing any sign specifically addressing the rules for that line at any point. Except maybe one at the start clarifying _who_ can use the line (though on that one I've also had the TSA agents go ahead and explain the rules entirely different than the sign they were standing in front of so...).

Also: here’s a list of things we are constitutionally not allowed to require, but if you choose to opt out you have a random 1:1 chance of being selected for an invasive “enhanced” screening.

Also: here’s where you can pay your bribe^H^H^H^H*Hfee to be prescreened so the whole process is easier for you unless we decide we you should be on the list that we randomly select for “enhanced” screening. Then your children get to watch a large man put his hands all over your body in ways that they’ve been told to never let a stranger touch you. And if you speak up, we’ll do it you your minor children too.