N.Y. C.P.L.R. 4540-a

Rule 4540-a. Presumption of authenticity based on a party's production\nof material authored or otherwise created by the party. Material\nproduced by a party in response to a demand pursuant to article\nthirty-one of this chapter for material authored or otherwise created by\nsuch party shall be presumed authentic when offered into evidence by an\nadverse party. Such presumption may be rebutted by a preponderance of\nevidence proving such material is not authentic, and shall not preclude\nany other objection to admissibility.\n