I heard a Texas judge state that: "Police are trained to judge speed." The defendant (not me) lost. (In that case, the defendant had been charged with speeding by a policeman who saw him from three blocks away, no radar.)
Of course, in NM, they all have radar: highway patrol, sheriff's department, city police, tribal police, BIA police, etc.
I understand that police officers probably become pretty proficient at judging speeds because of their on the job experience. But this guy was an EPA agent. His guess at her speed wouldn't have been any more accurate than mine.
BUMP!