The 1500m imposes upon you the requirement that you have to actually be FAST, rather than merely having endurance. He isn't like Lance, whose race takes hours a day for many days. He can expect to have to race for less than 4 minutes at a time, and runs at most 3 races in a few days with the first two (heats and semis of championships) being quite a bit easier. Moreover his races aren't always hard from the time the gun goes off--a lot of these races are run quite a bit slower than the capabilities of even the worst runners in the field, because no one wants to wear themselves out by leading a fast race. Then the pace goes insane on the last lap or two and to succeed you have to be the kind of runner that could run well under 50 seconds for a quarter mile when fresh, as well as being truly comfortable with, say, 3:56 mile pace.
Blood doping, peptides and short esters timed, let's not forget how many tests Lance "beat" ultimately most people have a price. I read somewhere there's a type of very expensive testosterone like something crazy for 1ml that raises the level they test against. Strictly anecdotal but it will make a high level of free test appear normal, idk how it works. Supposedly that's how NFL players can cycle test. I'll try to find a link but I won't. Also you can do multiple shots of test suspension ed and cut it out a few days before and be fine.
One drawback to Brennan’s study is that, unlike Kouri’s, there was evidence of attempted deception. Several people had to be excluded from the non-users’ group because they were either definitely on steroids (they failed the urine test), or probably on steroids (in the researchers’ words, they had “implausibly high muscularity and low body fat despite denial of AAS use”). However, even if a couple of users slipped in, they probably didn’t skew the data too much. The sample size for nonusers was big enough (131 people) that a few bad apples wouldn’t spoil the whole bunch, and the researchers were excluding suspiciously jacked people anyways, so if a few users did slip in, they apparently weren’t swole enough to raise any red flags.