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EUGENE, OR - JULY 26:  General view as flags of the IAAF and USA fly during day five of the IAAF World Junior Championships at Hayward Field on July 26, 2014 in Eugene, Oregon.  (Photo by Christian Petersen/Getty Images)
EUGENE, OR - JULY 26:  General view as flags of the IAAF and USA fly during day five of the IAAF World Junior Championships at Hayward Field on July 26, 2014 in Eugene, Oregon.  (Photo by Christian Petersen/Getty Images)

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    IAAF president: Doping will not be tolerated

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IAAF president: Doping will not be tolerated

CNN's Don Riddell discusses the fight against doping with Sebastian Coe, the president of the International Association of Athletics Federations.

IAAF president: Doping will not be tolerated

CNN's Don Riddell discusses the fight against doping with Sebastian Coe, the president of the International Association of Athletics Federations.