As I understand it there was a proposal to install such chips in children to prevent kidnapping and such last year in Congress (don't remember if it was House or Senate). I question the validity of the chips use, seems to me that tatooing the ear of the pet and placing this in a database would be much more efficient and a LOT less expensive. It would not require the vet to buy any special equipment or buy access to special databases. Also, what about small towns and rural communities w/ insufficient tax base to purchase the equipment for general use by the community? I can see it now, a black van w/ tinted windows rolls slowly down your street interrogating all the pet transponders determining who lives where and then comparing this w/ the official records of residence... When you take this in concert w/ real-time (or even small delay) financial record searches, the loss of freedom of speech, limitations on assembly, criminalization of crypto, etc. you are building a realy spooky scenario... I think I would prefer to have my cat or dog tatood instead of transpondered.