Incredibly fast 800s, incredibly fast 400s, incredibly fast 200s--and not just by one or two runners, either. Can we ascribe all of this to PEDs? I think not. I'm sure many (but not all) runners have been hitting clean PRs. This is a track like Monaco. Every year, runners go to Monaco and post times they can't repeat anywhere else. Every year, Chinese sprinters post times they can't repeat anywhere else. It's probably the track.