Lausanne-based CAS upheld the ban as part of an arbitration involving the International Association of Athletics Federation (IAAF) and the Russian Athletics Federation, citing in a statement "clear evidence" that he violated IAAF doping rules governing possession and trafficking of prohibited substances.
In a 2015 report, the World Anti-Doping Agency (WADA) wrote that Portugalov supplied performance enhancing drugs to athletes and coaches, administered doping programmes and "even injected athletes himself".
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(Reporting by John Miller; Editing by Michael Shields)
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