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Most of them make you flash your room key, but they don't really check to see if you're a current guest.

Edit: A few of the pools allow swim-up gaming. I believe they are legally required to allow you into their pool if you say you want to play blackjack there, since they can't offer private gaming

Edit 2: Some of the casinos have "Pool Parties" or "Day Clubs" or whatever, usually loud, booze-soaked affairs with big-name DJ's, which you do not have to be a hotel guest for, but you do need to buy tickets.

When I went in, they just checked for alcohol in your bags. They didn't ask for any proof of being a guest.

Which hotel? Most of the hotels require a room key to access the pools.

the larger resorts do have public pools because they sell a lot of alcohol there