The American sprinter Sha’Carri Richardson could miss competing in the 100 metres at the Olympics in Tokyo after testing positive for cannabis.
She had been regarded as a gold medal favourite, having run the sixth fastest time in history during trials.
The Anti-Doping Agency said she had accepted a suspension of one month starting from the end of June. She may still be able to compete in the 4×100 metre race.
We spoke to Michele Verroken, formerly the director of ethics and anti-doping at UK Sport. She is now the director of the consultancy firm Sporting Integrity.