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Panel: Perchlorate Levels in Drinking Water OK

A report from scientists who advise the government concludes that the levels of the toxic chemical perchlorate currently found in drinking water do not pose a major threat to the nation's health. But an EPA report from 2002 -- and some environmental groups -- contradict that finding. NPR's Jon Hamilton reports.

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Jon Hamilton is a correspondent for NPR's Science Desk. Currently he focuses on neuroscience and health risks.