Like a slow motion street arrest in an urban episode of COPS the IOC is actually catching drug cheats from a decade or so ago. I don't think any other professional sport or otherwise has been this aggressive in trying to nail drug cheats.
From the Australian:
"The doping tests in 2004 in Athens were already very sophisticated," [Jacques Rogge, IOC president] said yesterday. "Naturally, we will test them again to study all the possibilities."
The Beijing retests caught five athletes for use of CERA, an advanced version of the blood-boosting drug EPO. Rashid Ramzi of Bahrain was retroactively stripped of his gold medal in the 1500m.