I have doubts about opening thread.
I know a lot of athletes who stopped taking PEDS and kept training, but their performances hardly get anywhere near what they were when using.
for myself, performance is the defining empirical tool here rather than structural change observations.
Ben Johnson, three years after being caught was running over 3% slower for 60m; he only came good again in 1992 but he failed drug tests for testosterone-epitestosterone ratio.