It was recently brought to my attention that there is a bill (http://search.leg.wa.gov SB 5205) filed here in Washington state that seems to require that convicted sex-offenders wear the GPS-locating-watch so somebody (the police?) can track them at all times.
The catch is if it gets applied retroactively as the bill seems to allow. The U.S. Supreme Court ruled that Megan's Law is no violation of the "constitutional right to privacy" so that it could be applied retroactively to already-convicted offenders. Therefore it seems to me that if this "RF-ID law" is applied retroactively to sex offenders, the door is wide open for everyone else -- whether it's a GPS-watch or a Digital Angel chip implant. It's only the (current) will of the populace that would prevent wide-spread implementation, but that will last only until the next 9/11-like event where it's promised to the sheeple that such RF-ID will make them safe.
We might be almost there, coloradan.
But look on the bright side. You won't need to carry a driver's license, credit cards, passport, work ID, cash, voter registration card or anything of the sort anymore. They will *know* who you are. :-|