Yo do in my county as well. "any constrictor-type snake" is how it's worded, which includes balls. The regulations will be different according to where you are, but I know I have to have proof of where i received them, proof that they were imported legally or bred in the country, $50,000 in liability insurance, a statement from the vet that they're healthy, proof that they have adequate housing, etc etc.

Needless to say, I'm still getting to all of that...

Look up Animal Control for your area. They're the ones I have to register with here.