Cocaine is not a performance-enhancing drug. I have covered that subject many times. But, given that An Important Body says it is, players are in trouble if caught using it.
I have no problem whatsoever with Richard Gasquet's having his ban rescinded. However, I worked in the chemical dependency field for several years, and "I kissed a woman who had used cocaine and I didn't know it" is the most oft-cited "reason" for having a positive test result that I heard. I heard it over and over, and I heard several variations of it.
So Gasquet, who had a significant positive result, is free to play tennis, and Martina Hingis--who had a much less significant positive result--has a two-year ban.
Go figure. It's as if the people making the rules were...on drugs.