James Johnson from swainsboro high school ran a 4.01 on a laser
NB: The user providing the above answer hasn't provided any proof of this event and it doesn't show in a Google search - apart from this webpage. The 'official' record is 4.24, but the 'electronic timer' is started by hand and the players competing in this event at the NFL Combine do not wear helmet and kit.
The NFL's fastest official 40 yard dash time was 4.25 seconds by cornerback Fabian Washington.
4.33 -Unofficial. His Official fastest time is 4.41
Green's fastest recorded 40 time is 4.09 seconds. ------------------------- Green's fastest unrecorded 40 time is 3.81 seconds.
Bo Jackson 4.12 at the NFL Combine. Fastest verified 40.
As of September 2021, there is no official list of fastest 40-yard dash times specifically for NBA players. The 40-yard dash is primarily used as a measurement in American football scouting combines and not commonly tracked in basketball. Therefore, it is difficult to provide an accurate list of the top ten fastest times for current NBA players.
The fastest 40 yard dash time is 4.22 seconds, achieved by John Ross at the NFL Scouting Combine in 2017.
Chris Johnson
The fastest child on earth is 7.4
THe world record for fastest texting is 140 characters in 40 seconds
4.28 maybe
4.40
4.09 seconds