Foucault would have a field day with this… Just a quick read of the article brings up numerous implementation and technology issues with this (leaving aside the ethical, social and privacy related issues). For example, how do you keep the RFID tag on someone until they get on the plane? Do you give the person a new RFID at every airport? Do they keep the tag with them the entire trip? How do you keep them from swapping tags, or simply discarding it in a plant? How easy would it be to disable or mask one, and could the system pick that up if it happened?
And that’s just a minute or two of speculation. Give me an hour, and I could fill several pages, I’m sure.