Utah Code Ann. § 32B-4-209
(1)
(a) To inform a peace officer of a suspected violation and subject to the requirements of Subsection (1)(c), a person described in Subsection (1)(b) may:
(b) The following may take an action described in Subsection (1)(a):
(c) A person described in Subsection (1)(b) may take an action described in Subsection (1)(a) only:
(2) Unless the detention is unreasonable under all circumstances, the detention or failure to detain does not create criminal or civil liability for:
Enacted by Chapter 276, 2010 General Session