Utah Bans Radar Jammers, Not Radar Detectors, and Adopts the Federal CMV Ban

Utah legislated against jamming rather than detection, and Section 41-6a-609 shows exactly where the line sits. Subsection (1) defines a radar jamming device as any instrument or mechanism designed or intended to interfere with the radar or any laser that law enforcement personnel use to measure the speed of a motor vehicle on a highway. Subsection (2)(a) makes it an offense to operate a motor vehicle on a highway with such a device in the vehicle, and Subsection (2)(b) separately makes it an offense to knowingly use one to interfere with those radar signals or lasers. The section was last amended by Chapter 303 of the 2016 General Session and took effect 10 May 2016.

The definition turns on interference, not on reception. A passive detector alerts the driver that a signal is present without transmitting anything back at the police unit, so it is not designed or intended to interfere and is not caught by Subsection (2). An active laser jammer, sometimes sold as a laser shifter or diffuser, is caught, and so is a radar jammer, whether or not it works: Subsection (3) makes inoperability an affirmative defense to the possession charge under Subsection (2)(a) rather than an element the prosecution must disprove, so the burden sits with the driver. Subsection (4) exempts law enforcement personnel acting in their official capacity.

The absence on detectors can be proved from the code rather than assumed. A full-text search of the Utah Code on the Legislature's own search index returns zero sections for "radar detector," zero for "speed measuring device," zero for "speed detection" and zero for "jammer." The only sections that mention radar at all in the traffic context are Section 41-6a-609 and Section 41-6a-608, which restricts how police may use photo radar rather than what drivers may carry. Section 41-6a-608(2) allows photo radar only on a highway with a speed limit of 30 miles per hour or less or in a school zone, only with a peace officer present at the unit, only where signs are posted giving notice, only where a local highway authority's use is approved by that authority's governing body, and only where the citation is accompanied by the photograph produced.

Commercial drivers in Utah are governed the other way, and the rule that does it is administrative rather than statutory, which is why the Utah Code searches come back empty. Utah Code Section 72-9-301(1)(e) directs the Department of Transportation, with the Utah Highway Patrol Division, to enforce the Federal Motor Carrier Safety Regulations in Title 49 of the Code of Federal Regulations. The department implemented that through Utah Admin. Code R909-1, Safety Regulations for Motor Carriers, effective 23 June 2026, whose Section R909-1-3(1) incorporates by reference 49 CFR Parts 350 through 384, Part 385.4, Parts 387 through 399, and Part 40, as amended by the Federal Register through 22 June 2023. Part 392 sits inside that range, and 49 CFR 392.71(a) provides that no driver shall use a radar detector in a commercial motor vehicle, or operate a commercial motor vehicle that is equipped with or contains any radar detector, with Subsection (b) barring a motor carrier from requiring or permitting the violation.

R909-1-3(1) applies the incorporated federal rules to a motor carrier as defined in 49 CFR 390.5 and to intrastate commercial motor carriers as defined in Utah Code Subsection 72-9-102(3), excluding passenger vehicles designed to carry 12 or fewer people including the driver with a gross vehicle or combination weight rating under 13,000 pounds. Section 72-9-102(3) reaches intrastate vehicles at 26,001 pounds or more, or 16,001 pounds or more where the driver is under 18. That is what makes the federal detector ban bite on a purely in-state Utah truck that never crosses a state line.

A violation of Section 41-6a-609 is an infraction under Subsection (5), which Section 76-3-301(1)(e) caps at $750 before surcharges. Because Subsection (2)(a) reaches mere presence of the jamming device in the vehicle while it is operated on a highway, and Subsection (2)(b) reaches actual use, a driver who switches a jammer on can face both. The affirmative defense in Subsection (3) applies only to the possession charge under Subsection (2)(a), and only where the device was inoperative or could not be readily used at the time of the arrest or citation. 71(b) bars a carrier from permitting it. Nothing in Utah law authorises confiscation of a lawful passive detector from a private car.