This is getting a little to sci-fi, but why not implant a tracking device in every kid a few days after they are born. There wont even be a shayla for those who dont wear a watch on shabbos where there is no eruv. In fact, you will be able to keep tabs on your teens as well. Want to make sure he is in the beis medrash instead of the bowling alley, activate the locater. Want to make sure your teenage daughter is really at her friend studying and not at the mall with the wrong crowd, its a good thing you implanted that locater.
I agree with the maniac. I think we are going a little bit to far here.