The scientists say testing an animal for titers, or antibodies capable of neutralizing rabies, is a valid indication of the animal's resistance to the rabies virus. When the titer test measures 0.5 international units per milliliter or higher, the pet would be considered protected and may only need a booster if bitten or otherwise exposed to the rabies virus, depending on local rabies regulations.
Vet acceptance would be a good thing. Even better would be... the law. I can tell a vet no, but the law forces me to vaccinate my dog every 3 years.