This is also a "property(Premise's) right's issue that violates the U.S. COnstitution, you need to take note of, especially if you own a pet, in you association governed neighborhood.

Animal Identification System is Exactly the "Wrong" Answer!
http://groups.yahoo.com/group/Iowans_Against_NAIS/

Do you know about the National Animal Identification System (NAIS) that the government is working on implementing?

NAIS is a system that the USDA is proposing to identify all livestock in the United States and also identify all premises (locations with any livestock or pets).

This includes all birds, sheep, cows, pigs, horses, llamas and many other animals. The NAIS regulations can also be easily amended by the USDA to include any and all animals and pets of any kind, to include your dog or cat, and caged birds, like parrots.

The stated goal is to be able to have 48 hour trace back of all meats from the consumer to the farm where the animal originated incase of illness