Thanks, I misunderstood WADA's exact behaviour at international contests.
Complicating the issue still further is that some tests will be carried out by sporting bodies directly, some by national sporting bodies and others by international sporting bodies. And then there are multi-sport bodies like the IOC who will also carry out tests.
In any case, the point is that some countries are more aggressive about testing out-of-competition than others. Depending on the sport, that can make an enormous difference in performance.
Complicating the issue still further is that some tests will be carried out by sporting bodies directly, some by national sporting bodies and others by international sporting bodies. And then there are multi-sport bodies like the IOC who will also carry out tests.
In any case, the point is that some countries are more aggressive about testing out-of-competition than others. Depending on the sport, that can make an enormous difference in performance.