Gil Roberts

American sprinter Gil Roberts, who took gold at the 2016 Rio Olympics in the men's 4x400 relay, won an appeal of his doping ban after a US arbitration panel agreed with his "passionate kissing" defence. Roberts tested positive for traces of probenecid, a masking agent, and was suspended for four years last May, but an arbitrator overturned the ban last July, backing Roberts' claim that the positive test was caused by passionate kissing.