This document discusses doping in cycling. It mentions 4 cyclists who received bans for performance-enhancing drugs: Dave Bastien, Matthias Hooyberghs, Tijl Van Durme, and Kenneth Vandendriessche. It also discusses the roles of the Union Cycliste Internationale, World Anti-Doping Agency, and ADAMS system in fighting doping in sport. Finally, it lists some high-profile cyclists like Alberto Contador and Floyd Landis who received bans for doping offenses.