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}} Mark Ashton Richardson (born 26 July 1972 in Slough)〔(Mark Richardson ). Sports Reference. Retrieved on 2013-11-30.〕 is a British former athlete who competed mainly in the 400 metres. He competed for Great Britain in the 1996 Summer Olympics held in Atlanta, United States in the 4 x 400 metre relay where he won the silver medal with his team mates Iwan Thomas, Jamie Baulch and Roger Black. This team set a UK record, 2:56.60, in the process. At the 1997 World Championships in Athens, Richardson ran the anchor leg for Great Britain in the 4x400m relay, winning the silver medal. His unofficial split time was 43.5. On 7 January 2010 it was announced that Great Britain's 1997 World Championship 4x400m relay team are to be awarded the gold medal; they were beaten by a U.S. team that included Antonio Pettigrew, who admitted in 2008 to using performance-enhancing drugs.〔(Great Britain's relay heroes will finally be honoured )〕 ==Doping case== Richardson received a two-year ban from the IAAF after he failed a drugs test which was taken on 25 October 1999. He was suspended in March 2000 and subsequently missed the 2000 Olympics in Sydney.〔(Richardson suspended over drugs test ) bbc.co.uk〕 He tested positive for banned substance nandrolone, but claimed that he was unaware of taking the substance. Unlike fellow competitors Linford Christie, Gary Cadogan and Doug Walker, Richardson accepted the ban and chose not to pursue his case to arbitration.〔 The IAAF did re-instate Richardson in June 2001, under their "exceptional circumstances" rule.〔(Mark Richardson reinstated under Exceptional Circumstances rule ) IAAF.org〕 UK Athletics also cleared Richardson (as they did with Christie, Cadogan and Walker) as they believed there was enough reasonable doubt over the intention to take a banned substance.〔 The IAAF overrule such decisions because they hold athletes completely responsible for drug samples under a "strict liability rule"〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mark Richardson (runner)」の詳細全文を読む スポンサード リンク
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