Here's the
info on tribal owned casinos. Since casinos are already regulated under BSA, I don't think any third party is going to be anxious to say they must also be regulated as an MSB, but I know of nothing in writing that would support that view. I suggest you call FinCEN and ask if a casino is an MSB due to its check cashing activity, before you attempt to determine whether they are exempt from registration. Document the response you receive and, if you don't mind, repeat what they tell you here.