I would try the NAR (National Association of Realtors) website and you are in California the CAR website. They have quite an extensive Q & A set up on these websites of case law.
Check with your local Realtor association or the Statewide Association of Realtors. We have a local county counsel who updates us at our Broker/manager meetings and our legal staff at CAR (California Assoc. of Realtors) post to our Statewide site.