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London 2012 leads doping arms race

Jun 8 2012  Scientists say that advances in technology together with recent agreements between pharmaceutical companies and the World Anti-Doping Agency mean that London 2012 stands to be the cleanest Olympics yet. Vanessa Kortekaas, Olympics correspondent, looks at the progress made since the Beijing games and why more co-ordination is needed for earlier testing of athletes.  (2m 58sec)
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Filmed by Steve Ager. Produced by Seb Morton-Clark. Additional footage: Reuters.

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