Excuse me, Greyhound says differently.
https://www.greyhound.com/en/help-and-info/travel-info/your-rights-rules-on-board
A few dos and don’ts for riding Greyhound
We have a few rules to help us keep everyone safe and happy on board (including you) so please respect these rules when you ride with us:
Please stay in your seat while the bus is moving. When we say 'enjoy your trip' we don't mean rolling half way down the bus if it needs to stop quickly.
There's no smoking allowed on the bus (it’s against federal law). But don't worry, our buses stop about every two hours so you can have a smoke outside.
Please don’t take photos, video or make audio recordings of Greyhound staff, equipment or procedures (most of us haven’t been to acting school and just want to do our jobs).
Absolutely no alcohol, drugs or weapons anywhere on the bus (including in your checked baggage).
This is a stickler for us – no unruly behavior on the bus. No shouting, being loud, or generally disturbing the driver or other passengers. Just chill out, be nice and enjoy the ride.
We don’t let animals on board (not even Greyhound puppies). The only exception is legitimate service animals riding together with a disabled person. For more information, see our Customers with Disabilities page.