Except as required by a statute other than this act, a trust need not be evidenced by a trust instrument, but the creation of an oral trust and its terms may be established only by clear and convincing evidence.
Wyo. Stat. Ann. § 4-10-408
Evidence of oral trust
Official source: Wyoming Legislature. Reproduced from public-domain Wyoming statutes; confirm against the official source for the current text. Not legal advice.