There's a lot of funny in this thread. Of course there is some truth to what Hootie and now BWillie are saying, but most high schools don't have access to electronic timing equipment so if you consistently run a certain time, that is the time you tell. We understand there's an element of human error.
With that said, I ran a 4.87 when I was a sophomore in high school. I was probably about 5'4", maybe 110 pounds at that point and a total scrub. I was, like, 5th string RB although I did work my way up to starting KR duties
That was the last year I played football so I never ran it again but was always curious what I would have timed after I finished puberty.