I'd check the CA State Forum for that question. There is a Sticky Thread with info for Nurses there, and I hope there should be an answer for CNA's, too.
Ah, I did a search.....here's your info!
For Certified Nurse Assistants (CNA) and Home Health Aides (HHA), contact:
The Department of Health Services
1615 Capitol Ave
Sacramento, CA
916-327-2445
cna@cdph.ca.gov