When Galen Rupp and Mo Farah took 2nd and 1st at the Olympics, Bekele's agent, Jos Hermens, said that "science won the race." Be that as it may, Rupp has always been amazing. However, that doesn't mean he doesn't dope. Not getting injured, also, does not necessarily indicate being clean. Remember, PEDS improve recovery, and would allow for superhuman workouts to elicit superhuman fitness (and subsequent performances).
I am more suspect of Duane Solomon. I'm virtually sold on Jeter's dirtiness.