You are required, but they don't always check it. If you have an e-ticket they normally don't, but paper, they usually do. It's the driver that will ask for it as you are giving ticket for boarding.
Watch "Do They Check ID On Greyhound Bus?" on YouTube https://youtu.be/04cMwzkFEHs
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Does the Amtrak Thruway bus still go Bakersfield CA from Vegas downtown Greyhound station?
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