LOS ANGELES (AP) — Swimmer Jessica Hardy's trip to the Beijing Olympics could be in jeopardy after testing positive for a banned substance, according to a person familiar with the test results.

Hardy's "A" sample from the recent U.S. Olympic trials tested positive, the person told The Associated Press on Wednesday night. The person requested anonymity because he was not authorized to speak publicly.

Mark Schubert, head coach and general manager of the U.S. team, along with Hardy's agent and personal coach at Southern California did not immediately return phone messages left by the AP.

The Web site nbcolympics.com reported Hardy's backup "B" sample also tested positive. If so, the 21-year-old swimmer from Long Beach can pursue appeals with the American Arbitration Association and the Court of Arbitration for Sport. Any ruling by CAS would be final and binding.