The International Olympic Committee (IOC) has issued a response to allegations of double standards made by Sha'Carri Richardson.
The American sprinter tested positive for marijuana in the build-up to the Tokyo Olympics last year and was handed a ban which saw her miss the Games, where she was among the favourites to win 100m gold.
The 21-year-old compared her situation to 15-year-old ice skater Kamila Valieva'a, after it emerged last week that the Russian had tested positive for angina drug trimetazidine in the build-up to the Winter Olympics.
