Photograph : Southern Nevada Water Authority Facility - Las Vegas Sun News

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Steve George and Jennifer McCarville conduct fluoride detection tests in water samples at the inorganic lab within the SNWA's massive testing facility out near Lake Mead on Wednesday, July 9, 2014.

L.E. Baskow

Steve George and Jennifer McCarville conduct fluoride detection tests in water samples at the inorganic lab within the SNWA's massive testing facility out near Lake Mead on Wednesday, July 9, 2014.

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