The TSA is the last line of defense against sanity. Seriously, what was said above about it depending on the screener is dead on. Don't count on the TSA being reasonable or even following their own rules. Don't try to bring anything in carry on luggage that you are not prepared to part with. If you must give it a try, carry a stamped and self-addressed priority mail box with you as you are going to need it.

Craig.