[RickM]

I read an article that dealt with GPS tracking for kids. The transceiver could be implanted into the kid's arm or worn externally as a watch. The most obvious problem is the harm a kidnapper may cause trying to remove. Then there's the big brother stigma. Also, RFID must pass closely to a scanner so I see limited flexibilty for the kid tracker application.

Now if one wants to upload medical info because of a chronic illness I can see a market.