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According to a press release issued by the FIM, random urine tests for the presence of drugs conducted during the World Endurance Championship weekend May 5-6 at Brno, Czech Republic caught Swiss rider Herbert Graf with "a concentration of 32 ng/ml of metabolite of tetrahydrocannabinol, which is above the maximum tolerated conentration of 15 ng/ml. Mr. Graf did not ask for a counter-test with the B sample."
According to the same press release, "All the other samples tested showed the absence of any banned substances."
The press release also revealed the results of alcohol tests, and stated "All the alcohol controls were negative. The riders controlled were: Olivier Four (FRA), Michael Barnes (USA), Thierry Paillot (FRA), Igor Jerman (SLO), Heinz Platacis (AUS), Thorsten Wernke (GER)."