Totally agreed with Biological Profile: there is no possible way that anyone could ever run faster than Shannon Rowbury, so she is the true winner. 14:38 is the peak of human achievement (or whatever Shannon or another American runs). There is absolutely no other explanation for anyone ever running faster besides drugs.
Also it is obviously true that because there is weaker testing in Africa that everyone cheats. If you don't have fierce testing, there will be 100% doping.
And, of course, runners from Ethiopia have no advantages--genetic, cultural, or environment-wise--over runners from San Francisco.
And, finally, the only runners that cheat must come from poorer countries. How could having all the resources of Nike help you evade testing? No chance.