Answer
In 2016, the World Anti-Doping Agency (WADA) revoked Mattek-Sands' therapeutic-use exemptions before eventually approving one. This was a controversial decision, as many people felt that Mattek-Sands was being unfairly targeted due to her history of mental health issues. WADA's decision was eventually reversed, but the controversy surrounding it highlighted the need for more transparency and understanding in the area of therapeutic-use exemptions.