As I said, as far as I know, CA is the only state in the union that uses dogs to sniff out plants and soil. All we tax-payers are actually funding this. For some reason, CA got a huge federal grant that pays for the agents and dogs. Actually, I am in one of the counties that is not considered a "restrictive" or "quarantine" county. In other words, there are thousands upon thousands of counties that are automatically screened when shipping plants into CA. I think the entire state of Florida comes under that added scrutiny. I guess you would say that I am in a "clean" county.
I know how to properly label my plants that ship to CA and so long as I do this, it seems that my plants are not inspected, or if so, are not quarantined. Quarantine can and does result in losing the plants.
Now you know that when you see a seller state that he/she does not ship to CA (or HI), you can understand why.