Maybe 10% who ran got away clean.
Even that number may be high.
Now if we knew who the person was, we were more likely to look with less effort after an initial chase and instead just go get warrants for the new charges and set up watching where we knew they would turn up. We always got them eventually- they just ended up making things a lot worse when we did in exchange for that few days or weeks they eluded. A bad trade.
If we didn't know thier identity we worked it a lot harder- and you won't beat the dogs. Establish a perimeter and bring in dogs, if it was a serious enough pending charge we hit the Highway Patrol helicopter- we did that for a rape case, took 12 hours but we got him.
The few that made it away clean were ones that ran on foot and managed to make it to a vehicle we didn't know the description of before a perimeter was established- either stealing a car or having someone pick them up. And it helped if they were undocumented immigrants since they likely didn't have a name we could look up to get info on if we got a name, and were less likely to have fingerprints in the system.
But everyone who ran like that save for the exceptions we didn't catch eventually got a nice felony charge added on- mostly to what otherwise would have been a misdemeanor or in the absence of them running a minor felony they could have made a plea deal and taken down to a misdemeanor.
I remember one case where all we had was fingerprints from someone who ran from a B&E. Didn't catch him, no matches on record for the prints. Fast foward 4 years and he is arrested for DUI- prints came back against what we had on file and he got served for several felony charges and was picked up by our deputy and brought halfway back across the state.
Once again, advising anyone to run or fight the police is absolutely moronic, stupid advice that is highly likely to result in an outcome bad for them and their future.