More than likely a fingerprint will keep an innocent from going to jail rather than being incarcerated. Fingerprints are a physical feature, unless wearing gloves they are present to the public like a face. No invasive procedure is done, no swabbing, no pin *****, it is legal to expect to be ID if stopped. More than likely the gov already has your fingerprints if you have ever worked for them, or those younger their parents submitted copies when younger, a program I don't believe they do anymore. EVERY time a person is stopped for a traffic stop, I mean every time, there is a felony warrant, and records search. Did I say every time, so this is nothing new, if they got a hit I would fully expect them to take every means possible to make sure they have the right person.
Come on people YOU leave fingerprints everywhere you go. I once got the fingerprints from a murderer by picking up the can he drank a beer out of after he pitched it. Normally we would have picked him up, and printed him, but we wanted PC to do a search of his vehicle, and home without alerting him. Actually could have cited him for throwing the beer can out of his truck window. Once we had the prints that matched the murder scene in Missouri we served warrants for everywhere he could have left evidence, including his present GF house. So unless you plan on never touching anything your fingerprints are everywhere you go. If you are suspected of a crime you can be sure the police have them before actually being fingerprinted.
Today if you smoke a cigarette, and pitch it, the police have every legal right to pick it up, and run DNA. But I believe gathering DNA at a traffic stop is too expensive, and would be considered invasive. I get that people are upset about fingerprints being gathered, but it is legal, and no more different than using facial recognition. Which used to take a good amount of time before computers. Officers used to keep a binder with wanted criminals pictures in their car, fingerprints are no different, they are part of making an ID. Which the police have no right to do unless you have committed a crime, or are suspected of committing a crime. And breaking traffic laws in most states IS a crime.