Look at Florida........ Just as an example of how badly a Supreme Court (No state is immune to appointing dipshits) can become and make rulings in which it either does not have the authority and/or violate a federal law/statute. I have no source to say California Supreme Court has been so negligent as was Florida but it certainly is not immune to make the same mistakes.

I do not know California law and it's quite possible the State supreme court made the correct ruling according to the states constitution and NOT BASED ON COURT PRECEDENT! That is where most state supreme courts seriously screw up!
State Supreme Courts most common screw up's are because they will use Shepardized law and/or Court Precedent's instead of using the State Constitution!