What is the fastest 40 time ever recorded by an athlete?

Answer 1

The fastest time officially recorded by the NFL was 4.29 seconds by Deion Sanders in 1989, although the NFL did not begin electronic timing until 1990. In the electronic timing era, the fastest recorded time at the NFL Combine was 4.31 seconds by cornerbacks Fabian Washington, Chris McKenzie, Carlos Rogers, and Darrent Williams in 2005.