Signature Witnessing is used to verify that the notary public saw a signer sign a document other than an Acknowledgement (signature witnessing not required), a Jurat, an Affidavit, a Verification of Oath, or a Verification of Affirmation. In the state of California, this is used in conjunction with the use of one or two credible witnesses (see Credible Witness Criteria) when the signer does not have a valid ID.

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