Transperancy Spray?

Well, I was watching CNN and it looks like the Postal workers now are armed with a new weapon.. Against terror of course. THe whole cant read someone elses mail thing is out the window it looks like, they can spray this go on the letter and read through the envelope.. It seems implausable but its CNN, they dont lie right? well ANYWAYS, I now have a nice stash of black construction paper... Max Inux