The doping rules that cost Sha’Carri Richardson have a debated, political history

Richardson, 21, did not violate any codes pertaining to fair play. After learning of her biological mother’s death and facing pressure to perform at the U.S. Olympic trials, Richardson said, she used marijuana in Oregon, where it is fully legalized. But the World Anti-Doping Agency lists THC as a substance of abuse alongside cocaine, heroin and MDMA/ecstasy. It tests athletes for substances of abuse only during competition, not during training.