http://en.wikipedia.org/wiki/Wang_Junxia
"Her coach Ma Junren claims that the fungus Cordyceps sinensis helps her physical condition. There was significant controversy claiming illegal performance enhancing drugs must have been used by the Chinese team. It was claimed the Chinese team did not submit to the requested random drug testing. [1] Prior to the 2000 Olympic Games in Sydney, 6 athletes coached by Ma Junren were tested positive for performance enhancing drugs, resulting in both their and Ma Junren's expulsion from the Chinese team."