I've thought a lot abotu this myself. Those of you who feel that this is an 'over protective parent' have not had a child abducted. I have nto either but I can only imagine the torture that a parent must feel when such a horrible thing happens. Unfortunately it happes all too often.
If I had the opportunity to simply login to a site to find my child (if ever such a horrible thing happend), I'd be oh so grateful to be able to find him/her in a rapid time. Let's assume that the child's clothing and possessions are not with them at the time of abduction.
If we can put a chip into a pet, why not into a child? Once the child is 18, they can remove/turn it off if they so choose.
I know i am not the only person who feels this way.