Don't know what company had introduced the chips about 10 or 15 years ago, but then every veterinarian in the country was offered a free scanner if they signed up for the chip program. Many times the chip will migrate and not be in the same place it was originally placed. This happened with my Greyhound and it took a x ray to verify that the chip was still in the dog, but couldn't be read for some unknown reason. It worked when installed, but not 6 months later. Like with all registration things, veterinarians are not going to check every dog that comes in with a chip and record that number. They are even less likely to run the number to verify the true ownership of the dog. It is bad for business and they just are not going to upset a customer that has a legitimate reason for having a dog that is chipped to another person vs. one that is stolen. Many shelters aren't going to the trouble either to find owners. I know of a local shelter that was called every day for a week asking if the dog was in there. The reply was always the same..... NO. The people finally gave up in despair and decided to adopt another dog. When they got to the shelter, they found there dog. It was chipped and registered, but no one took the time to do the follow up. They didn't even keep good enough records to know what dogs were present being held. Then they wanted to charge an adoption fee for the people to get there own dog back. Not saying that they are all bad, but the bad ones give the good ones a black eye.