Not only has Carl Lewis never admitted to taking drugs (that I'm aware of), he's been known to sue people who accuse him of taking drugs. This writer needs to be careful.
Lewis was often very outspoken during his career against those athletes who used perfomance enhancing drugs. He stressed his Christian beliefs and fair play and was very damning of those who were caught out, particularly Ben Johnson. However, in 2003 Lewis admitted that he had tested positive three times for banned stimulants during the 1988 Olympic trials. Lewis claimed that he ingested the banned substances by mistake in an "herbal supplement". He was allowed to compete in the Seoul Olympics after the U.S. Olympic Committee ruled that his use of stimulants was "inadvertent" and not performance-enhancing. In Seoul he went on to receive the gold medal in the 100 metre sprint after the disqualification of Canada's Ben Johnson. Some scientists believe that the failed tests could be evidence of "masking drugs" used to conceal the use of more serious substances such as steroids. The International Olympic Committee has affirmed that Lewis' medals will not be revoked because it maintains a three year statute of limitations on such cases. Allegations have been made that the USOC did not properly enforce IOC policies on banned substances.