This is due to a state law passed in 1999 which prohibits the possession, breeding, or sale of ferrets as pets. The law was passed due to concerns about ferrets carrying diseases and being potential carriers of rabies.
While there are some exemptions for certain purposes (like research and education), it is illegal for most people to own ferrets in California.
If you are passionate about ferret ownership, you can contact your local representatives to advocate for changes to the law.
It's important to note that this is a complex issue with arguments on both sides. Be respectful of all perspectives when engaging with this topic.