German showjumper Christian Ahlmann is back in the running to ride at the 2012 Olympics after the Court of Arbitration for Sport (CAS) deemed an International Olympic Committee (IOC) regulation as “unenforceable”.

Fifth in the world rankings, Mr Ahlmann was banned from competiton for eight months after his horse C ¶ster tested positive for the banned substance capsaicin at the 2008 Olympics.

Under IOC rules this barred him from future Olympic Games. But on 6 October the CAS overturned the rule, which applies to all athletes banned for more than six months for doping.

This news story was first published in the current issue of Horse & Hound (13 October, 2011)