People entered in this category have either:

1. Been suspended by a sporting body (the UCI, the IOC, or one of their national federations) for illegal performance-enhancing drug use.
2. Publicly admitted such use.
3. Been found to have taken illegal performance-enhancing drugs by a court of law.
4. Been suspended by a sporting body for failure to submit to mandatory drug testing.

See also: List of athletes who tested positive for banned substances.