Dr. Mario Thevis is Professor and head of the Centre for Preventive Doping Research at the German Sport University of Cologne. He is also Director of the European Monitoring Center for Emerging Doping Agents (EuMoCEDA), a forensic chemist, Editor and Chief of the journal Drug Testing and Analysis, and a Research Scientist with the Partnership for Clean Competition. In this episode, Mario discusses new research focusing on the athlete exposome.