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This is from an article in a newspaper. So obviously, it's not a "law" that states a casino can refuse to cash chips. If it is, I'd like to see a like to the specific law. Not a newspaper article.
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It is not only a law, but it is a requirement in some cases:
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12.060 Use of chips and tokens
....
4. A licensee
shall not redeem its chips or tokens if presented by a person who the licensee knows or reasonably should know is not a patron of its gaming establishment
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From Regulation 12 of the Nevada Gaming Statutes and Regulations.
http://gaming.nv.gov/stats_regs/reg12.pdf
Good enough?