Gil Roberts, a U.S. Olympic 400m runner, successfully argued that kissing his girlfriend led to him unknowingly ingesting a banned substance and failing a March drug test.
Roberts, a Rio 4x400m relay gold medalist, was provisionally suspended in May after both his A and B samples from a March 24 test came back positive. He had a small amount of the well-known banned masking agent probenecid in his system.
On June 20, an arbitrator cleared Roberts of wrongdoing, allowing him to compete at the USATF Outdoor Championships two days later. Roberts finished second in the 400m in a personal-best time, qualifying for the world championships in London in August.