California isn't the US's biggest state....

Anyways, I would say legalize it, but until a reliable way to check if someone is currently high, like if you pull them over, is achieved, I don't see it being a safe idea. The saliva test is only accurate for up to around 24 hours, but even then, can't say if you are high while driving. If anyone knows a way this could be achieved, tell me, because as far as I know, there isn't one.