Originally Posted by
breny
Carrying documentation can be useful in the case of a reasonable screener or supervisor. In the case of a rogue "Respect mah authoritah" screener or supervisor, it's pissing in the wind. Over and over and over travelers on this forum cite instances of being told "the rules changed today" or yesterday, or whenever. Seldom is this the case. The majority of the time it's a "make up the rules as we go" screener on a power trip.
I think the OP was referring to an electronic copy downloaded onto a PDA or other similar portable device as opposed to reams of paper tucked in a notebook.
Don't forget, the airlines can be a powerful ally should you encounter an unreasonable TSA supervisor.