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Identifying the Signer: Satisfactory Evidence
California's strict, statute-driven rules for verifying who is signing. The signature theme is that personal knowledge is not allowed—identity must rest on acceptable ID documents or credible witnesses.
Satisfactory Evidence and the No-Personal-Knowledge Rule
California uniquely bars personal knowledge as a way to identify a signer, relying instead on documents or witnesses.
Satisfactory evidence means acceptable identification documents or the oath of a credible witness (or two).
Personal knowledge of the signer is NOT an acceptable method of identification in California.
Even a signer the notary has known for years must be identified by document or credible witness.
The signer must always personally appear before the notary.
Acceptable Identification Documents
The statute lists which documents qualify and what features they must contain.
A current California driver's license or DMV-issued ID card is acceptable.
A valid U.S. passport is acceptable; qualifying foreign passports and Canadian or Mexican driver's licenses may also qualify.
Acceptable ID must contain a photograph, physical description, signature, and a serial or identifying number, issued by an authorized agency.
The document must be current or issued within the past 5 years.
Social Security cards, birth certificates, and credit cards are NOT acceptable identification.
Credible Witnesses
When a signer lacks acceptable ID, credible witnesses can establish identity under strict conditions.
A single credible witness must personally know the signer and be personally known to the notary.
Two credible witnesses may be used if each personally knows the signer and each is identified to the notary by acceptable ID.
The notary must place each credible witness under oath or affirmation before relying on them.
A credible witness must have no financial interest in the transaction and must not be named in the document.
Special ID Situations
Some acceptable documents apply to particular populations, and expired cards can still work within limits.
An expired ID remains acceptable if it was issued within the previous 5 years and meets the other requirements.
A CDCR inmate identification card is an acceptable document, and a facility official may serve as a credible witness.
A qualifying U.S. military ID card is acceptable when it contains the required photo, description, signature, and number.
A government agency employee ID qualifies only with the required photo, description, signature, and serial number—an ordinary employer badge does not.
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Last updated: July 2026