And I have this on the best possible authority.
Unless, as it turns out, you live in San Jose. Seems the city, being hard-pressed to make ends meet, has started requiring cat licenses. Even for indoor cats.
There's no cat detector van (yet), but apparently vets are required to report unlicensed cats to the city if the critters are brought in for rabies vaccinations.
Which creates an incentive not to get one's moggie vaccinated against rabies, no?
(Neener-neener-neener dept.: I don't live in San Jose. Nor do I have a cat. So there!)