Utah Code § 9-23-316

(1) The commission shall make rules in accordance with Title 63G, Chapter 3, Utah Administrative Rulemaking Act, establishing boxing contest weights and classes consistent with those adopted by the Association of Boxing Commissions. (2) The commission shall make rules in accordance with Title 63G, Chapter 3, Utah Administrative Rulemaking Act, establishing contest weights and classes for unarmed combat that is not boxing. (3) (a) As to any unarmed combat contest, a contestant may not fight another contestant who is outside of the contestant's weight classification. (b) Notwithstanding Subsection (3)(a), the commission may permit a contestant to fight another contestant who is outside of the contestant's weight classification. (4) Except as provided in Subsection (3)(b), as to any unarmed combat contest: (a) a contestant who has contracted to participate in a given weight class may not be permitted to compete if the contestant is not within that weight class at the weigh-in; and (b) a contestant may have two hours to attempt to gain or lose not more than three pounds in order to be reweighed. (5) (a) As to any unarmed combat contest, the commission may not allow a contest in which the contestants are not fairly matched. (b) Factors in determining if contestants are fairly matched include: (i) the win-loss record of the contestants; (ii) the weight differential between the contestants; (iii) the caliber of opponents for each contestant; (iv) each contestant's number of fights; and (v) previous suspensions or disciplinary actions of the contestants.