Star U.S. sprinter Sha'Carri Richardson suspended for month after positive marijuana test, putting Olympics in doubt

Star sprinter Sha'Carri Richardson has been suspended for one month after testing positive for marijuana, the U.S. Anti-Doping Agency (USADA) announced Friday, putting her participation in the Tokyo Olympics in doubt. 

Shortly before the decision was announced, the 21-year-old Richardson took responsibility during an interview on "Today." "I know what I did. I know what I'm supposed to do ... and I still made that decision," she said.