According to California Government Code Section 8205, a California notary may not notarize any document that is incomplete.

8205.

“(a) It is the duty of a notary public, when requested: …

(2) To take the acknowledgment or proof of advance health care directives, powers of attorney, mortgages, deeds, grants, transfers, and other instruments of writing executed by any person, and to give a certificate of that proof or acknowledgment, endorsed on or attached to the instrument.  The certificate shall be signed by the notary public in the notary public’s own handwriting.  A notary public may not accept any acknowledgment or proof of any instrument that is incomplete.”