A few years ago, facial recognition software was still in early stages in casinos and not very accurate. I wonder if things have changed a lot.

Is it pretty common for casinos to have this now, and is it accurate?
If you get backed off at one place, could a sister property or even an unrelated place identify you with just computers?
Or is it always surveillance operators that would identify you?
Could a hat or glasses easily foil the technology?
Will it likely become a much bigger threat in the future?