American swimmers at the olympics finishing races with purple faces. Why? "Asthma" gives them a therapeutic exemption to massively dose Ventolin before the start. Ventolin is a bronchodilator - it opens up the airways in the lungs for greater airflow and oxygen absorption. But not cheating, oh no.
Now this statement from the World Anti-Doping Agency:
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I believe this has happened in the UFC, Jon Jones was at least given a lighter sentence for passing on information after he pissed hot.
And on the ventolin there was a fight on the Contender series where a (very tired) Greg Hardy used a ventolin after the second round. I didn't know it was illegal at the time, anyway Hardy won but it was ruled a no contest in the end.