How to Verify Signer Identity Under California Law: The Complete ID Rule

Why Identity Verification Is the Heart of Your Role

The primary purpose of a notarization is to deter fraud by confirming that the person signing a document is who they claim to be. If you fail at this step, everything else you do is meaningless — and you may be personally liable for any resulting harm.

California Government Code Section 8230 specifies exactly how a notary may establish the identity of a signer. There are three methods:

Method 1: Personal Knowledge

If you personally know the signer — meaning you have known them for a sufficient length of time to be certain of their identity — you may rely on that personal knowledge without requiring any identification document. However, this standard is high. Casual acquaintance is not sufficient. In practice, most notaries use document-based verification to be safe.

Method 2: Satisfactory Evidence by Document

This is the most common method. California law specifies the following acceptable identity documents:

• An identification card or driver's license issued by the California DMV (must be current or issued within the past five years)
• A United States passport (current or expired within five years)
• An inmate identification card issued by the California Department of Corrections and Rehabilitation, if the signer is in prison
• Any form of inmate identification issued by a sheriff's department
• A foreign passport with a valid U.S. visa attached (with a stamped arrival/departure record or I-94 form)
• A driver's license or nondriver ID issued by another U.S. state or territory, a Canadian or Mexican driver's license, a passport issued by a foreign government, a military identification card, a U.S. Permanent Resident Card (Green Card), or a government-issued consular identification card — provided the document contains a photograph, description, signature, and serial or ID number

Method 3: Credible Witness(es)

If the signer cannot produce an acceptable ID, identity may be established through one or two credible witnesses:

• One credible witness: The witness must be personally known to you (the notary) and personally known to the signer. The witness swears under oath that the signer is who they claim to be.
• Two credible witnesses: Both witnesses must present acceptable identification to the notary and must personally know the signer — but they do not need to be personally known to the notary.

Credible witnesses must also swear that they believe the signer is telling the truth and that the circumstances of the signing appear to be legitimate. Both the witness(es) and the signer must sign your journal.

Red Flags That Should Give You Pause

Even when acceptable ID is presented, certain behaviors should raise your alertness to the possibility of fraud or duress:

• The signer cannot explain what the document is or what it does
• A third party is speaking for the signer or answering your questions on their behalf
• The signer appears confused, impaired, or under pressure
• The document or ID appears to have been altered
• The signer's physical description doesn't closely match the ID photo

If you have any reason to doubt the signer's identity, their capacity to consent, or the legitimacy of the transaction — you have both the right and the professional duty to decline the notarization.

When in Doubt, Don't

No document is worth your commission, your reputation, or your liability. If something feels wrong about an identity verification, trust that instinct. The right call is always to decline and suggest the signer seek assistance from an attorney or a different notary who can resolve the identity question.