Weldon,
Did you see the recent apology letter by the American cyclist in various mags? He does a credible job of explaining why he used EPO.
Sev told me YEARS ago after Barcelona tha Hermans explained how athletes avoided the dehydration danger by using blood thinners on top of EPO..
Frankly, I think the new versions of EPO are so advanced that we are talking about antedeluvian stuff on this board. The chemists are way ahead of the testers.
As you know, Weldn, marathon training is all about the preparation; therefore, EPO and its variants can boost recovery during this period and then the athlete can halt his or her use and test completely clean.
Another thought: EPO might benefit aerobic events more than the 800 or mile. So the full or half Mary or even 5000m stands to be more tempting for EPO users. that said, look at doubtful Marion and other fully guilty sprinters that admitted to EPO use for a damn full out anaerobic event !!!