Absolutely Werewolf! They don't have to convince everyone that it's the best thing ever, they only have to convince some people that those who reject the idea are backwards, paranoid rednecks, people who don't care about their kids welfare, etc.
Those of you not outraged or at least more than a little uncomftorable with this idea submit to being under the wing of the nanny state. So shame, shame, I know your screen name. And Big Brother does too...
By starting these things on a small scale, on a young population, a group of people that in general we want to protect the most, they prime the whole for further implementations of this technology. Just like another poster said, it's that frog in a cold pot of water... cold for now.
How is this that much different than the lefties trying to ban .50 cal's because they're too big, or 'pocket pistols' because they're too small? The plan has always been the same, erosion instead of head-to-head confrontation. Slight infringements instead of sweeping broadstrokes.
What real value does this system have anyway? You know where the tag is, and not necessarily the children. Even if the children kept them on, which they won't, is it worth millions of dollars to know that little Tommy is trying to skip class in the bathroom playing cards? Even if a child was abducted, which I assume this is what it mainly prevents, the guy has already got the child before the 'system' can alert people to do much about it.
Teachers over the last couple of hundred years have done just fine. I think this is an answer to a non-problem.
-Spooky