The Umpire wrote:
Fairly common knowledge that people like Calvin Smith raced clean.
And quite possibly he has run the fastest "clean" time in history although it was done at altitude, Colorado Springs. The possible fastest "clean" time for women might very well be from the same meet, Evelyn Ashford.
I am not saying that someone could not have run faster than these two, just that if it were proven that no one has done so "clean" I would not be at all surprised.