Location privacy (unlike the domain of audio privacy -- such as wiretapping legislation) has basically no definition in the law. Meanwhile, there are a lot of practical uses for companies to use GPS tracking (e.g. truck route efficiency algorithms), however practically no legislation governing what it can and can't be used for. Recent stories about iPhone tracking indicate that people feel its intrusive, but without legislation that outlines appropriate use, companies are just going to make it up as they go along.

It would appear from all the grandstanding and know-it-all responses to this thread, that the US has gotten something right: every family is able to make choices about schooling according to their values, capabilities, and needs. That freedom is not something to be taken for granted. To those who want to home school -- more power to you! If you want to send your kids to the public schools -- good for you! It's a shame that social structures exist that prohibit parents from doing what they believe is right for their kids.