We're in complete agreement.
To add to your nightmare scenario, could you imagine the part of the testimony where the wife "forgets" to tell the court they had a huge backyard hamburger & hotdog barbecue with thirty-five friends and family members in attendance? Suddenly a couple cases of beer aren't quite so threatening. The so-called innocuous little RFID tags can't prove that part of the story, though.
~ Blue Jays ~
"Congress shall make no law...abridging...the right of the people to peaceably assemble...
Suppose you were having a gathering of like-minded individuals to discuss politics in the 30 days before an election in violation of McCain/Fiengold campaign finance laws. If the driver's license or money or passport or anything you are required to carry has an RFID tag in it that identifies you directly, the government can know you were there and then use that information against you. If they have no way of knowing the movements of people in a free society without tagging us, we retain the right of the people to peaceably assemble.
Maybe a bit of a stretch, but indicative of the possibilities on that slippery slope we head down.