Originally Posted by
Boggie Dog
TSA's rules are regulations -- they are not federal laws.
They are not even that. In practice what is in the regulations, posted on the TSA website or otherwise released to the public are merely guidelines.
Each airport is its own little fiefdom where these guidelines may be followed, ignored, modified or invented at each level from the FSD down to the tub stacker. Ignorance of them is no defense, they are whatever the TSA employees say they are.