i have heard of one company that will put chips humans. it was ment for parents that want to put a tracking chip in their child if they should ever run away or be kidnapped.
i couldnt do it to my dog so i sure as hell could never do it to a child.
Oh yes, it happens every day on an immense scale. And the amazing thing is, people tend to do it themselves. Yes, they stuff their bodies full of chips almost on a daily basis.