United States' Alysia Johnson Montano and South Africa's Caster Semenya cross the finish line 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/Anja Niedringhaus)

Associated Press
United States'  Alysia Johnson Montano and South Africa's Caster Semenya cross the  finish line 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/Anja Niedringhaus)
United States' Alysia Johnson Montano and South Africa's Caster Semenya cross the finish line 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/Anja Niedringhaus)
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