Carl Lewis was not accused of using steriods but tested positive three times before the 1988 Olympics for pseudoephedrine, ephedrine, and phenylpropanolamine, banned stimulants and bronchiodilators also found in cold medication, and had been banned from the Seoul Olympics and from competition for six months. The USOC accepted his claim of inadvertent use and overturned the decision. Fellow Santa Monica Track Club teammates Joe DeLoach and Floyd Heard were also found to have the same banned stimulants in their systems, and were cleared to compete for the same reason. The positive results occurred at the Olympic Trials in July 1988 where athletes were required to declare on the drug-testing forms "over-the-counter medication, prescription drugs and any other substances you have taken by mouth, injection or by suppository." For further details on this see http://en.wikipedia.