Isaac Brekken / The New York Times
The asbestos research of Brenda Buck, left, and Rodney Metcalf led to a report suggesting a cancer pattern in parts of Nevada, but the state prevented the release of the report, at Henderson, Nev., near Las Vegas, Jan. 30, 2015. Research indicating a natural asbestos hazard in the air has been played down and hindered by the state of Nevada, scientists say.
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