We got our puppy chipped, in case she wandered away and got lost. That cost 60$ and the company that offers this service isn't some joke: it's endorsed by every high-end vet in the Northeast USA. But everytime we go to the vet, they ask: is she chipped? We say yes and they run a scanner over her to pick up the signal (to get the number) and this takes 4-5 minutes . I figure we wasted 60$: no one at an animal shelter is going to spend 5 minutes trying to find a signal. As regards nefarious plots on the part of the US government to chip people, I've got no opinion; but I can say that perfectly legit people, trying to use this stuff to a good purpose, don't seem to have made the tech work.