This article is just saddening. Apparently Senator Joe Lieberman and Homeland Security Secretary Janet Napolitano are getting lobbyist money from the companies making the highly expensive strip-search scanners currently being sold and deployed in airports, because they seem to think these things might be necessary for rail and bus lines as well--nevermind that those kinds of delays would likely be a death blow to those industries in some places.
I can't think of any other reason to even be considering this in light of the kind of pushback they're receiving from the new electronic strip searches at airports. (Yes, I'm fully aware the fapping scanner operator story was a hoax, but it illustrates that this is a real problem if the very idea upsets people that greatly--call it what you like, but citizens are being strip searched, facilitated by technology.)
Sounds quite a bit to me like the manufacturers of the electronic strip search devices have decided to hedge their bets on future sales by trying to get inroads into other transportation systems.