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Harrah's Entertainment, which owns the Rio, asks the police to conduct periodic integrity checks on its nightclubs, pools and other amenities to make sure they are operating within the law.
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The closing of the pool, which featured dancers from the Sapphire Gentlemen's Club topless, comes as Nevada gaming regulators are taking a closer look at the amenities that operate at businesses in casinos.
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Gaming Control Board member Randall Sayre issued a letter in April saying regulators were taking a closer look at nightclubs, ultralounges and European pools where licensees might be found to "be indifferent to the conduct or welfare of patrons."