New York Consolidated Laws, Civil Practice Law and Rules - CVP Rule 4540-a. Presumption of authenticity based on a party's production of material authored or otherwise created by the party

Material produced by a party in response to a demand pursuant to article thirty-one of this chapter for material authored or otherwise created by such party shall be presumed authentic when offered into evidence by an adverse party.  Such presumption may be rebutted by a preponderance of evidence proving such material is not authentic, and shall not preclude any other objection to admissibility.