The reality is even more amazing than the graph lets on, because Usain has never failed a drug test, whereas the 4 people directly to his left have, and the 5th

The reality is even more amazing than the graph lets on, because Usain has never failed a drug test, whereas the 4 people directly to his left have, and the 5th person suspiciously missed enough drug tests to be temporarily banned. It's only when you get to Bromell and Kerley whose times are at the very top of the chart that you see times that come from clean runners.