Some good friends of ours have a 12-year-old who is autistic. He's a runner, meaning that he frequently escapes the house and just heads out. This is very scary for them, as you can imagine, because they keep wondering if the next time will be the time he gets into a serious accident, or some other scary situation. He ran just two nights ago, and the police eventually found him after about 2.5 hours and he was 3 miles or so from home.

Anyway, they have tried numerous GPS devices with no luck. Their boy is very adept at getting rid of the devices. So, I thought I would ask the Oracle: do any of you have any experience with this sort of thing? Any suggestions on what they could try?