Utah Code § 77-23-103: Circumstances permitting an administrative traffic checkpoint.

A motor vehicle may be stopped and the occupants detained by an enforcement officer when the enforcement officer:

(1) is acting pursuant to a duly authorized search warrant or arrest warrant;

(2) has probable cause to arrest or search;

(3) has reasonable suspicion that criminal activity has occurred or is occurring;

(4) is acting under emergency circumstances; or

(5) is acting pursuant to duly authorized administrative traffic checkpoint authority granted by a magistrate in accordance with Section 77-23-104.