Tyler Hamilton (search) will keep his Olympic cycling gold medal because a backup drug test was inconclusive, the International Olympic Committee (search) said Thursday.

Hamilton tested positive for signs of blood doping (search) in the initial A sample Aug. 19 after his time-trial victory in Athens.

But analysis of the B sample failed to confirm the original finding because of "lack of enough intact red blood cells," the IOC said in a statement.

As a result, the IOC said it dropped its investigation into the case and "would not be pursuing sanctions regarding this matter."