Would you lilke to keep tabs on your kids via GPRS?

[TotalControl]

Lets say you have kids between the age of 3 - 11. An age where they're not quite ready for carrying a phone around with them full time. Would you be perfectly happy to 'tag' them? Like a GPRS watch or even something simple like an NFC tag with ID on it (encrypted, of course) in the event your child goes missing and the police locate said child?