When were B vent furnaces (direct out the wall) made illegal in California? What was the date?

I know that these units are now illegal, but were they illegal in 2008? I'm guessing Yes, but if there is a plumber out there who can tell me with some confidence that they have been illegal for many years I'd appreciate it. I have two, and they allow the wind to blow products of combustion back into the house. I need to get two sealed units to replace them, but I'm wondering why the plumbing supply store sold them to me in the first place if they are illegal. I bought them in October 2008.