Sherdog.com is reporting that the number one contender to the UFC Heavyweight Title, Alistair Overeem, has tested positive for elevated testosterone levels, which could be an indication of steriod use.
The report notes that Overeem must appear before the Nevada State Athletic Commission before he can fight UFC Champ Junior Dos Santos at UFC 146. The test he must take is part of the conditional license he received to fight Brock Lesnar at UFC 141. You can read much more by clicking on the above link.