Per the NYTimes, Yuriy Bilonog and 3 other Athens Olympic medalists have tested positive after retesting stored samples:
"Nelson said he was elated at hearing the news of Bilonog’s positive test on Wednesday.
“I heard rumors about Yuriy and doping at the Games,” Nelson said. “But I dismissed them. But now it comes to light that it’s true.”"
Can't imagine only finding out now that you were the gold medalist, 8 years later...