Brady Ellison, ranked No. 1 in world recurve archery, tested positive for a prohibited substance in an out-of-competition test but was found not to be at fault and remains eligible to qualify for his fourth Olympics.
The U.S. Anti-Doping Agency found that Ellison took a permitted oral prescription medication that did not list the prohibited substance HCTZ on the label.
HCTZ, short for hydrochlorothiazide, is a diuetic and masking agent prohibited by the World Anti-Doping Agency. It increases urine volume and dilutes other substances in a urine sample.
In a statement Monday, USADA CEO Travis Tygart said, "If an athlete ingests a prohibited substance from a completely innocent source such as contaminated medication, meat or water and there is no effect on performance, there should not be a violation or a public announcement.