Say what you will about California, but in this regard, they are quite strict about whether olive oil produced in California is exactly what it is claimed to be. The California Olive Oil Council and the Olive Oil Commission of California make sure of this. Don't be fooled by fancy labels on imported olive oil, there is no guarantee that what's inside is the real deal.
I’ve read somewhere that there is no way the existing olive groves can supply the gallonage of olive oil that ships.
This is why blue states are healthier than red states.