US sprinter Erriyon Knighton banned for four years due to a positive steroid test.

US sprinter Erriyon Knighton, 21, has been banned from competition for four years after testing positive for the banned substance trenbolone, an anabolic steroid. Knighton initially claimed the positive test was due to meat contamination, but the Court of Arbitration for Sport upheld appeals from WADA and World Athletics, rejecting his claim. The ban takes effect immediately, ruling him out of the 2028 Los Angeles Olympics.