Does the non-party needs to attach a declaration that the document is a true copy of original? Is it acceptable to use the document like the verification that is attached to all party production of documents?
If you have subpoenaed business records from a third party, there would be a declaration from the custodian of records authenticating the documents. If you are at trial, the custodian of records of the entity can also authenticate the documents during testimony.
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Lawsuit / Dispute Attorney
If you're referring to a business records subpoena, which I think you are, you will probably need a declaration authenticating the documents. You could also have the documents orally authenticated at trial.
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Employment / Labor Attorney
In a standard response to a request for production of documents, the responding party is not required to authenticate the documents other than to sign the verification that accompanies the written response. You can establish authentication by use or Requests for Admissions, or in deposition, or by operation of law with regard to several kinds of documents.
Good luck to you.
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