[jrewingjr]

They HAVE to use the forehead or hand.

They will probably use the hand for most people, but I fear that they will be putting these in the foreheads of infants, in the baby's "soft spot", so when the child's cranium matures it will be virtually impossible to remove. You can dig one out of your hand, but who will be able to covertly remove one safely from their child's skull?

[Hemlock]

They will probably use the hand for most people, but I fear that they will be putting these in the foreheads of infants, in the baby's "soft spot", so when the child's cranium matures it will be virtually impossible to remove. You can dig one out of your hand, but who will be able to covertly remove one safely from their child's skull?

Interesting points. Also, some people don't have right hands or any hands, but everyone alive has a forehead.