World 100m champion, Christian Coleman has been banned for two years after missing three drugs tests.
The 24-year-old American, who is suspended from 14 May 2020, will miss the postponed Tokyo Olympics next summer.
Coleman won the 100m gold at the World Championships in Doha in 2019.
World Athletics’ Disciplinary Tribunal upheld the charge and banned Coleman for two years, backdated to 14 May, 2020.
He has 30 days to file an appeal to the Court of Arbitration for Sport (CAS).