So far, these devices require one to actually wave an instrument nearby to read it, so it's not like they can track you across the country with one. A chip that could do that is still pretty large and needs power. On the other hand, how many times a day do you go between those metal bars in a store or something that checks to see if you're walking out with a CD or something? Are they checking your ID and transmitting it to the Beast Ashcroft for your Permanent Record?

I have no problem with these as long as they are voluntary for normal citizens. Nor do I have a problem with sticking parolees with them, as long as they can be removed after parole is ended.

Paranoid types will examine every zit, assuming that someone poked one of these into them while they were asleep. I can see making big bucks selling "chip detectors" to keep such types mollified.