Olympic gold medalist in race walking, Alex Schwazer, has been provisionally suspended following a positive doping test. The German anti-doping agency, Nada, announced the investigation after a sample taken from the 41-year-old Italian athlete following a competition in Germany showed indications of prohibited substances. Both urine and blood tests triggered the investigation, according to Nada. Schwazer maintains his innocence and has publicly stated he is not guilty of doping. The specifics of the prohibited substance have not been disclosed. This is not Schwazer’s first doping controversy, having previously been banned for similar offenses. The investigation is ongoing, and further details are expected to emerge as the process unfolds.