If they were that good at it, then they would sweep down TWO cars when both are speeding rather than cutting the faster car loose.
According to your standard, sure.
An officer has some discretion as to whom he pursues.
If a defendant wants to challenge the officer's accuracy, I'm sure he can do so during trial. If the officer can't consistently estimate speed with reasonable accuracy, then the defendant could be found not guilty.
But this ruling means the burden of proof would be on the defense to show that the officer's estimate was wrong.
I’ve seen a LEO nab two at a time.
Please be careful what you wish for .