President Joe Biden suggested on Saturday that rules banning Olympic athletes from competition for marijuana could potentially change when asked about the suspension of U.S. runner Sha’Carri Richardson from at least some events at the upcoming games in Tokyo after she tested positive for cannabis.  

Sha’Carri Richardson will miss her main event at the Tokyo Olympics for smoking weed. But it’s not even clear that marijuana is a peformance enhancing drug. http://slate.com/culture/2021/07/shacarri-richardson-marijuana-ban-tokyo-olympics-why.html