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Testing by AP finds water at 2016 Olympic sites 'rife with human sewage'

The Rodrigo de Freitas lake, which was largely cleaned up in recent years, was thought to be safe for Olympic rowers and canoeists. But an investigation by The Associated Press found it to be among the most polluted sites. 

The AP commissioned tests over a five-month period. Experts who reviewed the results found that not a single venue is fit for swimming or even boating.