Utah Code § 78B-5-617
§ 78B-5-617. Writings bearing obvious alterations -- Explanation required.
(1) The party producing as genuine a writing which has been altered, or appears to have been altered after its execution in a part material to the question in dispute must account for the appearance of alteration. (2) The party may show that the alteration: (a) was made by another without the party's concurrence; (b) was made with the consent of the parties affected by it; (c) was otherwise properly or innocently made; or (d) does not change the meaning or language of the instrument. (3) An altered writing that a party cannot adequately explain under Subsection (2) is not admissible.