Utah Code § 77-7-7.1: Use of force in making a temporary detention by a private individual.

(1) If a private individual temporarily detains another individual under Section 77-7-3, the private individual may use reasonable force to effect the temporary detention of the other individual if:

(a) the other individual who is being temporarily detained flees or forcibly resists after being informed of the private individual's intention to make the temporary detention; and

(b) the private individual's temporary detention of the other individual is lawful.

(2) Deadly force in making a temporary detention may only be used if the situation justifies the use of deadly force under Section 76-2-402, 76-2-405, or 76-2-407.