USA sprinter Knighton handed four-year doping ban

United States sprinter Erriyon Knighton has been handed a four-year prohibition aft nan Court of Arbitration for Sport partially upheld appeals from World Athletics and nan World Anti-Doping Agency against a determination not to suspend him.

The 21-year-old tested affirmative for trenbolone - a banned constituent utilized for musculus maturation - successful March 2024.

He avoided a ban pursuing an independent arbitrator's ruling and was cleared to compete astatine nan 2024 Olympics, but is now banned pinch contiguous effect.

Knighton, who vanished 4th successful nan 200m successful Paris past summer, was not selected successful nan USA squad for nan World Championships, which return spot from 13-21 September successful Tokyo, Japan.

He was intially cleared aft submitting grounds claiming nan adverse findings were owed to nutrient contamination.

World Athletics and Wada recovered nan grounds "fell short of nan required impervious of source" and was "statistically impossible", and Cas has now ruled successful their favour.

"The Cas sheet wished that location is nary impervious that would support nan conclusion that oxtail imported into nan USA would beryllium apt to incorporate trenbolone residues astatine nan level required to person caused nan athlete's adverse analytical finding," Cas said.

Meanwhile, Ethiopian mediate region runner Diribe Welteji will besides miss nan World Championships aft Cas upheld a provisional suspension while her doping lawsuit is heard.

The 23-year-old, who won 1500m metallic astatine nan 2023 World Championships successful Budapest, was charged pinch failing aliases refusing to taxable a doping sample by nan Ethiopian Anti-Doping Authority successful precocious August.