According to several online sources, Bob Hayes' time in the 40 yard dash wasn't recorded. See The Fastest 40 Yard Dash Ever.
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The NFL's fastest official 40 yard dash time was 4.25 seconds by cornerback Fabian Washington.
my brother goat sets the record for best 40 yard dash time and its 4'01
Bob Hayes in 1964. 100 yards in 9.1. 100 meters in 10.04
bo jackson hes not on the 40 yard dash list but he ran it in 4.12 seconds and im not even joking.
Reggie Bush. 4.32