American sprinter Erriyon Knighton has been cleared to compete at the U.S. Olympic trials after an arbitration panel determined his positive test for the banned substance trenbolone was due to contaminated meat. Knighton, who tested positive during an out-of-competition test in March, was found not at fault or negligent by the U.S. Anti-Doping Agency (USADA). The World Anti-Doping Agency (WADA) has reserved the right to appeal the decision. Knighton, a prominent 200-meter runner and the youngest male to make the U.S. Olympic team since 1964, will compete at the trials in Eugene, Oregon. This case occurs amid ongoing tensions between U.S. and global anti-doping authorities, highlighted by recent controversies involving Chinese athletes.