Darrell Green ran an unofficial 4.09 40 yard dash in training camp in 1986 for the Washington Redskins. He is considered by many as one of the best corners of all time. Many see him as the fastest man in NFL history, having won several NFL's Fastest Man competitions.
Bo Jackson is second ran a 4.12
Deion Sanders is third ran 4.17 and 4.57 backwards at Florida State University Pro Day
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The fastest electric time was 4.21 by Chris Johnson. The fastest hand time (which was always off) was Bo Jackson at 4.11.