The TSA continues to <self-censored well-reasoned, but derogatory opinion>. The only notable exception that I have experienced is Salt Lake City where people seem to be trained to read the scanner and polite behavior and respectfulness abound. If you are not traveling out of SLC, then prepare for vague and obscure rules to be interpreted randomly and illogically. I have been hassled like a terrorist for carrying an extra laptop battery, a standard sealed lead acid battery with a cigarette lighter plug attached (Road Pro Accessory), and a Fenix flashlight without any crenelated bezel or ninja attachments. All of which are clearly allowed under the written rules.

The lesson is that if you have any doubt, put it in your checked luggage (yeah, pay the extra $25 for a checked bag)or leave it at home. If you want to risk it, go early and carry a priority mail box addressed to yourself with postage attached.

And forget about any redress after the fact, your item was not "confiscated", you were just not allowed to board the plane with it. Its your choice what you do with it.