LA SVEGAS (KLAS) -- A former anti-smoking advocate who spent decades fighting tobacco use was stunned to find a $419 smoking fee on her hotel bill -- raising questions about the accuracy of the sensors hotels use to detect smoking.

Mary Ferguson and her husband visit Las Vegas every month. In July, they stayed at the Rio Las Vegas. Ferguson said they chose the property to see its renovations and because it offered her a good deal.

“The trip was fine, up until check out,” Ferguson said. “That's where we discovered this problem.”

At checkout, Ferguson saw that the hotel had charged her a $419 smoking fee.

“I do not smoke,” Ferguson said, “My husband does not smoke. We have never smoked. In fact, I was a health educator doing tobacco cessation for nearly 20 years.”

Ferguson said she work

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