U.S. sprinter Sha'Carri Richardson has been suspended for one month after testing positive for marijuana, the U.S. Anti-Doping Agency announced Friday morning.⁠ ⁠ The positive test result invalidates Richardson's performance at the U.S. Olympic trials in Eugene, Oregon, where she won the women's 100-meter dash, and will prevent the 21-year-old from competing in her signature event at the Tokyo Olympics later this month.⁠ ⁠ Richarson issued an apology on NBC's "Today" show on Friday morning.⁠ ⁠ "I want to take responsibility for my actions," Richardson said on NBC. "I know what I did. I know what I'm supposed to do. I know what I'm allowed not to do, and I still made that decision."⁠ ⁠ In response to a question from host Savannah Guthrie, Richardson confirmed that she ingested marijuana after an interview with a reporter in which the reporter informed her that her biological mother had died. She said it was a heavy emotional burden for her to carry on the eve of such a critical event, and that it sent her into a state of "emotional panic." ⁠ ⁠ "It's never been a steroid. It will never be a steroid," she said.⁠ ⁠ Marijuana is prohibited in-competition under World Anti-Doping Agency rules.