Can't they out think this?

I really fear for the species if the nippers cannot think of ways to fool this.

Any kid dumb enough to get copped by this would just give the correct answer when the parents ask "where did you go today?".

A few notes on GPS (having recently been in that industry). Many of the newer fancier implementations work pretty well indoors, even in thick multi-storey concrete parking structures etc.

Some (eg. Snaptrack) hardly use any power and just sniff the RF and send data back to a server for processing.

Ultimately, technology is a poor substitute to parental caring.