Shayna Jack: Australian swimmer tests positive for banned substance

    Australia's Shayna Jack was hoping to win a medal at the World Swimming Championships in Gwangju, South Korea.

    (CNN)Australia swim star Shayna Jack has confirmed she tested positive for a banned substance in the lead up to the World Championships in Gwangju, South Korea.

    Jack, 20, withdrew from the event just days before she was supposed to compete citing "personal reasons".
    But on Saturday, Jack published a statement in which she confirmed she had tested positive for a banned substance on June 26.