The US Anti Doping Agency has launched an investigation into the activities of the American athletics manager, Mark Block, who is currently serving a ten year suspension for his involvement in doping.
Block was implicated in the infamous BALCO scandal and provided his wife, sprinter Zhanna Pintusevich-Block, with Tetrahydrogestrinone otherwise known as "The Clear" the undetectable steroid compound. Pintusevich-Block famously defeated the now disgraced Marion Jones to win the 2001 IAAF World Championships 100m title.
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