I dare you.
(or if you believe, at this point, all of them dope (who meet the highest level criteria), then say that.
I'm not trying to shame anyone. Just trying to discern the realities at the highest level of the sport. Is it even possible to run 26:30 or 12:40 or 3:28 without doping? I'm guessing not. Shoes help, sure, but the top Africans, plus the U.S., Euro and Aussie/NZ/other athletes who are seriously contending for medals and all-time list marks? Unfortunately, I believe it's not possible w/o doping, because too many folks have been doing so not to.
They all have to make this choice, if they want to have a chance at the very top. Now, those are making U.S. teams but not necessarily contending for medals? I could believe there's still holdout non-dopers at that level, yes. But if you want to be the best, you have to do what the best are doing, unfortunately. You may get caught, or you may not if you know the latest strategies and are savvy enough.
I don't know, you tell me. Is all that basically the truth, or is it still possible to be at the highest level and be clean?