 He has on two occasions finished in last place in the General classification of the Tour de France, thereby 'winning' the red lantern.Casper was suspended from his team, Agritubel because he tested positive for corticosteroid, an asthma drug that is banned unless the user has a medical exemption for its use, during the 2008 Tour de France by the Agence Française de Lutte contre le Dopage.The exemption had been renewed but with a previous asthma medication than the one prescribed and used during the Tour de France.