Caster Semenya will have to rethink the rest of her career.
The Court of Arbitration for Sport issued its ruling on Wednesday.
The IAAF wants female athletes with differences in sexual development to take testosterone blockers.
That ruling means officials can implement new rules on testosterone levels.
The rule applies to female athletes running between 400 metres and a mile.
They could force athletes to undergo hormone therapy if their levels exceed certain limits.
You might also like…#WCW with gorgeous Lulu Menziwa: Pictures
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