American sprinter Sha’Carri Richardson, who will return to action this weekend after a month-long ban, said on Friday that while her positive cannabis test kept her from competing at the Tokyo Olympics she is happy it bought attention to her sport.The flamboyant American sprinter was expected to be one of the biggest draws in Tokyo but her dreams were cut short due to a positive test at the U.S. Olympic trials in June after she had streaked to victory in the 100m.Richardson’s ban dominated the storylines ahead of the Tokyo Olympics and while it cost her a potentially career-defining moment she said some good came as a result.