Yes, sorry for the typo. They do not normally scan a pet. Most are only proactive if someone ask for the pet to be scanned or if they have info about an animal fitting that description.
A local breeder told me a story yesterday about the owner of two of their French Bulldogs. Her babies got out and after a few days a lady called them and said that she had one of them and returned it to the owner. Sometime later, the owner got a call from the local P.D. asking her about her lost pet. Apparently, her dog had been scanned by a local vet. When she arrived to get her pet, it just so happend that the person that brought the dog to the vet was the SAME person who had "found" the first dog.