their victory should be taken away if someone at the time was covering up the doping.
But what do we mean by "covering up?" Did somebody forge false drug test results?
From where I stand, the whole point of drug testing is to determine if someone is using illegal drugs. If drug tests fail to turn up any signs of illegal drugs, the person passes the test.
Witnesses popping up after the fact saying, "Yeah, but he totally did
use illegal drugs" doesn't really count as solid evidence.
If he did somehow manage to outsmart the test and pass while still taking illegal drugs, then there's something wrong with the test. I don't condone cheating, but let's actually prove he did cheat before we crucify the guy.