Have you ever notarized an I-9 before? If it were me, I would ask an Attorney, the Secretary of State, or Immigration if a notary public could notarize this form. If you are a notary, the most important thing to do is to clarify that you are NOT an Attorney, and can not give legal advice. Also clarify that you are not an immigration expert and can not advise on matters pertaining to immigration either.
But, it is not generally illegal to notarize a signature on a document.
Have any of you had to notarize an I-9 before?
How about a K-9?
You might also like:
Notarization for Thai immigrants
Affidavit of Citizenship
Notary procedure for Affidavit of Support documents