Positive doping test for World Championship bronze medalist Chester Weber (USA); possible violation of anti-doping rules

This concerns a possible violation of human anti-doping rules. In other words, it was not one of the horses, but the U.S. rider Chester Weber himself who had substances in his system that have no place there, even outside of competition. Doping tests for human athletes in equestrian sports are conducted by the International Testing Agency (ITA). In a sample taken in May during the Royal Windsor Horse Show, the ITA detected banned substances in Category S1. According to the World Anti-Doping Agency (WADA), S1 substances are anabolic agents, including both steroids and nonsteroidal drugs. These are substances that build muscle and break down fat, such as testosterone, nandrolone, stanozolol, and trenbolone. Clenbuterol, which is used in asthma medications and has frequently been detected in doping tests among track and field athletes—particularly swimmers and cyclists—also falls into this category.

What will happen to Chester Weber’s placings and World Championship medal if doping is confirmed?

For now, only the result of the A sample is available. Chester Weber now has the right to request that the B sample be tested. Until then, he remains provisionally suspended. This suspension has been in effect since September 29, 2026.

A spokesperson for the International Equestrian Federation (FEI) said that, at this stage of the investigation, it is impossible to say to what extent Weber’s second-place finishes in Windsor and Szilvásvárad (HUN), his third-place finish in Rastede, and his third-place finish at the World Championships in Aachen might be subject to sanctions. Should the results be disqualified, Dutch rider Bram Chardon would be awarded the bronze medal by default. He had finished fourth in Aachen.