World Championship 200 metres silver and bronze medallist American Erriyon Knighton, has been cleared to compete at the US Olympic trials.

Knighton tested positive for a banned substance earlier this year but was subsequently cleared after an independent arbitrator ruled that the substance was more likely than not …………….ingested through contaminated meat.

The 20-year-old sprints star, tested positive for a metabolite of Trenbolone during an out-of-competition drug test on March 26, this year .

Knighton was provisionally suspended by the United States Anti-Doping Agency (USADA) on April 12 .

After a full evidentiary hearing on June 14 and 16, which involved knighton, usada and witnesses, an independent arbitrator determined that the US athlete would receive a “no fault” violation.

This meant that his provisional suspension was immediately lifted and he is cleared to compete at the upcoming US Olympic trials which begins on Friday .

Both the World Anti Doping Association (WADA) and the Athletics Integrity Unit have a right to appeal the arbitrator’s decision.