Doping at the World Athletics Championships
As a signatory to the World Anti-Doping Code, the International Association of Athletics Federations (IAAF) prohibits the use of banned performance-enhancing substances by competitors at the World Championships in Athletics. A list of WADA-banned substances is regularly published to the public and amended as scientific knowledge expands.
Source: Wikipedia — Doping at the World Athletics Championships (CC BY-SA 4.0)