It’s a great way for the government to get fingerprint samples from everyone. Just for their own protection, you know. It would never be used for any nefarious purpose by the government.
“Oh, and while you are at it, could you give a DNA sample as well. It’s for your own good.”
Perhaps, but the notary doesn’t file the fingerprints with the state until he or she resigns as a notary and files the notary journal with the local County official which keeps them for future reference. At least in California, so long as the notary keeps working, the journals are in his or her keeping. It would be a pretty inefficient way to build a database, especially since notaries are not trained in taking fingerprints and the prints might be good to compare to a fingerprint of the person claiming he has been impersonated by another but I doubt it would be much good in general fingerprint identification. The print is generally just a simple pressed thumb without rolling, usually with some clear lines in the center.