I found these proposed rules:
Maybe you know where to look to find out if the proposed rules were actually adopted, but I expect they were.
Included in the rules is:
(b) Credible witness.
(1) The identity of the individual appearing before the notary public may be established by the affidavit of a single credible witness personally known to the notary public and who personally knows the document signer.
(2) A credible witness may not have a direct or pecuniary interest with respect to the record being notarized.
(3) The credible witness shall make a verification on oath or affirmation that the following is true:
(i) The individual appearing before the notary public is the person named in the document.
(ii) The credible witness personally knows the individual appearing before the notary public through dealings sufficient to provide the credible witness with reasonable certainty that the individual has the identity claimed.
Two influential states, California and Florida, require the credible witness(s) to state that the person being identified does not have any of the identification documents recognized in the notary law, and it would be difficult to obtain them. This twist is unique to California and Florida. The other states laws or rules don’t have this requirement. There might be some unofficial advice to prefer identification documents over credible witnesses, but officially, outside CA and FL, it’s just fine to use a credible witness because it would take the signer 15 minutes to fetch his driver license from the parking lot.