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The suit alleged that the ranching operations were harming coastal waters, and cited examples from the park service’s own studies that found fecal pollution in some areas.

But their small lab is testing for fecal bacteria - not arsenic.

Excess ingestion may, however, cause urinary and fecal color change.

Hepatitis A is spread through food or drink contaminated with tiny particles of fecal matter, according to the World Health Organization.

By examining the fecal samples from people, they linked a specific enzyme in bacteria, beta-glucuronidase, as a key factor that allows the drug to enter the bloodstream.