A number of nandrolone cases in athletics occurred in 1999, which included high-profile athletes such as Merlene Ottey , Dieter Baumann and Linford Christie .  However, the following year the detection method for nandrolone at the time was proved to be faulty. Mark Richardson , a British Olympic relay runner who tested positive for the substance, gave a significant amount of urine samples in a controlled environment and delivered a positive test for the drug, demonstrating that false positives could occur, which led to an overhaul of his competitive ban. 
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