If the subscribing witness denies or does not recollect the execution of the writing, its execution may still be proved by other evidence.
Utah Code § 78B-5-609
Proof of execution when subscribing witness denies or forgets
Renumbered and Amended by Chapter 3, 2008 General Session
Official source: Utah State Legislature. Reproduced from public-domain Utah statutes; confirm against the official source for the current text. Not legal advice.