I'm by no way an expert but...
In my eyes, casinos are private property, but open to the public for commercial purposes and customers are welcome (as "invitees", thus not trespassing). Once you have been communicated that you are not welcome anymore, all subsequent entries on the premises would be deemed trespassing.
You can find the Mississipi trespass act on the Mayor's legal references list and it reads as follows:
"Section 97-17-97, Mississippi Code of 1972:
97-17-97. (1) If any person or persons shall without authority of law go into or upon or remain in or upon any building, premises or land of another, including the premises of any public housing authority after having been banned from returning to the premises of the housing authority, whether an individual, a corporation, partnership, or association, or any part, portion or area thereof, after having been forbidden to do so, either orally or in writing including any sign hereinafter mentioned, by any owner, or lessee, or custodian, or other authorized person, or by the administrators of a public housing authority regardless of whether or not having been invited onto the premises of the housing authority by a tenant, or after having been forbidden to do so by such sign or signs posted on, or in such building, premises or land, or part, or portion, or area thereof, at a place or places where such sign or signs may be reasonably seen, such person or persons shall be guilty of a misdemeanor, and upon conviction thereof shall be punished by a fine of not more than Five Hundred Dollars ($500.00) or by confinement in the county jail not exceeding six (6) months, or by both such fine and imprisonment.
(2) The provisions of this section are supplementary to the provisions of any other statute of this state "
I think that the statute of limitation bars prosecution of crimes after a certain amount of time has elapsed, which means that if you haven't been caught for trespassing after a few years, you cannot be prosecuted for this purpose any more. I do NOT think that this changes what I said before about your having lost the invitee status when you were read the trespasser act.
Upon entering the casino, the staff could thus retain you until they hand you over to the police that might arrest you for trespassing. The maximum penalty is impressive (up to 6 months jail), but I have no idea what a judge would really impose. It all depends on local practice.
All I can tell you is that it would probably not be safe on the legal side.
Now, I have also read that players play peacefully in casino where they have been read the trespass act before, and they would need to tell you more about this. I have no experience.
Royam
the trespasser act.