Well, according to sources, details of the gender testing that was carried out on the world 800m winner Carster Semenya shows that she is actually a hermaphrodite.
Note, this is still alleged and an official statement has not been released. However, if this is true, it is likely she will be stripped of the medal and banned from any future female races.
She is also being kicked around like a political football by the IAAF and ASA, which cannot be good for her, and makes both sides look really poor in the way this case has been handled.
The biggest problem is lack of real precedent in this kind of case. Should she be banned from women's races, is there anything that can be done chemically to allow her to continue competing, or should she be competing in the men races?