During the 2008 Summer Olympics, Ahlmann's horse tested positive for the banned substance capsaicin along with the horses of three other riders, and was subsequently suspended from the Games. Because of the doping charge, the German Olympic Sports Confederation sent a bill to Ahlmann for his travel and accommodation costs at the Games. As a result of the doping offence, he has been struck off the German 'A-Kader' list of elite riders. 
- ↑ Freeman, Margaret (2008-08-21). "Four show jumping horses suspended for doping". CANOE. http://slam.canoe.ca/Slam/Olympics/2008Beijing/News/August/2008/08/21/6524486-ap.html. Retrieved 2008-09-29.
- ↑ Kirschbaum, Erik (2008-08-23). "Germany's Ahlmann to be told to refund costs". Reuters. http://www.reuters.com/article/GCA-Olympics/idUSPEK3946820080823. Retrieved 2008-09-29.
- ↑ Parkes, Louise (2008-09-24). "Ahlmann struck off list". Irish Independent. http://www.independent.ie/sport/other-sports/nations-cup-finale-for-horse-show-1481146.html. Retrieved 2008-10-03.
- Official website (German)