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German Sport University Cologne: A Chinese expert in pharmaceutical analysis has called for further analysis of U.S. swimmers' samples to sort out controversy over their flushed faces at the Paris Olympic Games. Despite the conclusion of the Paris Olympics, debate continues over the facial discolouration observed in some American swimmers after they competed in Paris.

The expert, who asked not to be named, pointed out that it is crucial to base any suspicions on concrete evidence, reports Xinhua.

"Without proper scientific testing, accusations of drug use by any athletes remain unfounded and lack the necessary rigor from results in laboratory analysis," said the expert.