 Complete the following phrase:  In June 1997, the IAAF banned Decker from competition. In September 1999, a USATF panel reinstated her. The IAAF cleared her to compete but took the case to arbitration. In April 1999, the arbitration panel ruled against her, after which the IAAF  through a retroactive ban, even though she was cleared to compete  stripped her of a silver medal she had won in the 1500 meters at the 