Another case of doping is Maria Sharapova a famous russian tennis player. She has admitted that had regulary consumed meldonium since 2006, a substance that was included in the performance-enhancing drugs list of the World Anti-doping Agency in 2016. She has appealed the sanction because she says that she dind't review the list of illegal substances. The Court will resolve the appeal next september.
I don't know why she took this substance maybe is for reducing the pain in her muscles but before taking the substance she has to know the consequences in front of a drug test.