South Africa's Caster Semenya competes in a women's 800-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Wednesday, Aug. 8, 2012. (AP Photo/Martin Meissner)

Associated Press
South Africa's Caster Semenya competes in a women's 800-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Wednesday, Aug. 8, 2012. (AP Photo/Martin Meissner)
South Africa's Caster Semenya competes in a women's 800-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Wednesday, Aug. 8, 2012. (AP Photo/Martin Meissner)
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