German sports news service SID reported that Ahlmann has been suspended from his individual jumping event after his gelding Cöster tested positive for illegal substances on August 17. Ahlmann had been a medal favorite for his event on August 21.
The 33-year-old was European champion twice in 2003, but will now be subject to new Fédération Equestre Internationale (FEI) doping rules, the sports news service reported. Cöster had the substance capsaicin in his bloodstream, the FEI legal department told SID. The substance is derived from chili peppers and is used topically to increase blood circulation.
Despite the scandal, Germany still has the most wins for equestrian events in Beijing with five medals, FEI reported on Thursday.