In 1988, Ben Johnson was stripped of his Gold. His time was 9.79, which would not have been beaten until Bolt in 2008 - 20 years later. Johnson admits to doping, but also is adamant that Carl Lewis was also not racing clean.
Everybody knew it was roids, but even so it indicated that the human body was capable of it.
Johnson has a reputation in the gym for squatting as much as powerlifters.