Radar detector laws by state

Are radar detectors legal? The short answer

A radar detector is a receiver that alerts a driver to the radio signals police use to measure vehicle speed; that is the definition the Federal Communications Commission (FCC) uses in its own rules. In a private passenger vehicle, a radar detector is legal in 49 of the 50 states. Two U.S. jurisdictions prohibit radar detectors in every vehicle: Virginia, under Va. Code § 46.2-1079, and Washington, D.C., under 18 DCMR § 736.

Two further limits apply in every state. Federal motor carrier rules bar radar detectors in commercial motor vehicles (CMVs) nationwide: 49 CFR 392.71 reaches trucks, buses and other vehicles in interstate commerce with a gross vehicle weight rating (GVWR, the maximum loaded weight the manufacturer sets) or gross combination weight rating (GCWR, the same figure for a vehicle and its trailer) of 10,001 lb or more. Military installations are the second limit. Bases such as Fort Leavenworth and Fort Huachuca prohibit detectors in their installation traffic codes, and those codes bind every driver on post.

One qualification governs this whole page. In 49 states, "legal" means that no law prohibiting passenger-vehicle radar detectors was located when the codes were checked in October 2026. It is a finding of absence, not a citation to a provision that grants permission, and no state government page confirming legality was found. Windshield mounting is a separate question: most states restrict objects on the windshield, and in several states the suction-cup mount, not the detector, is what the code text reaches. This page describes what the codes say. It is not legal advice, and the current text of any code section should be checked before anyone relies on it.

How the table was checked and what each column means

• Passenger vehicles. "Illegal" appears only where a prohibiting law or regulation was read from an official source, which happened in Virginia and D.C. "Legal" means no prohibition was located.
• Windshield mounting rule. A one-line summary of the windshield-obstruction law. Some entries come from mirrors or older editions (Alabama 2006, New Jersey 2013, Hawaii 2010).
• Statute. The provision that bans detectors, or "No statute prohibits" where none was found.

Five windshield entries are marked "Not retrieved": Mississippi, New Mexico, Oklahoma, Tennessee and Wisconsin. Those official code sites were blocked or hosted behind LexisNexis during the October 2026 check, so their windshield rules are unverified here. In Colorado, Maine, Missouri and North Carolina only a window-tint provision was found. A general windshield-object law was not located in those four states, which is not the same as confirming that none exists.

Full vehicle-code text searches were run only for Wyoming, Minnesota, Oregon, Nevada, North Dakota, Delaware, South Carolina and D.C. Elsewhere, "legal" rests on the absence of any located prohibition.

Radar detector laws by state: all 50 states and D.C.

Passenger-vehicle legality, windshield rule and governing statute for each jurisdiction, as checked in October 2026. Federal 49 CFR 392.71 applies to interstate commercial motor vehicles in every row.

Virginia: the only state that bans radar detectors

Virginia Code § 46.2-1079 is the only state law that prohibits radar detectors in passenger cars. Subsection (A) makes it unlawful to operate a motor vehicle on Virginia highways equipped with any device designed to detect, or purposefully interfere with or diminish, the measurement capabilities of police radar, laser or other speed-measuring devices. It is equally unlawful to use such a device and to sell one in Virginia. The same section therefore covers jammers as well as detectors.

Three details carry most of the practical weight. First, the presence of the device is prima facie evidence (evidence that proves the point unless the driver rebuts it), and the Commonwealth does not have to prove the detector was switched on. Second, subsection (B) supplies a defense: a person is not guilty if the device had no power source and was not readily accessible to the driver or any passenger. A detector stowed unplugged in the trunk fits that defense; a detector wired to the dash does not. Third, subsection (D) states that no DMV demerit points are assessed. The section sets no fine, so any dollar figure quoted for a Virginia detector ticket comes from another source and was not verified here.

Police may hold the device as evidence. The law provides for its return rather than forfeiture, and a court may order unclaimed devices destroyed after six months. Subsection (C) exempts law-enforcement vehicles and sales to police. The full text is published by the Virginia Legislative Information System.

Washington, D.C.: a 1961 municipal regulation, not the D.C. Code

The District of Columbia bans radar detectors through 18 DCMR § 736, a section of the D.C. Municipal Regulations (Title 18, Chapter 7), not through the D.C. Code. A full-text search of the codified D.C. Code, which the D.C. Council publishes as XML, found no radar-detector section. The regulation's source is Commissioner's Order 61-2026, effective Nov. 21, 1961, originally Article 25, § 16 of the District's Police Regulations.

The regulation has three parts. Section 736.1 bars selling, or offering for sale, any device designed to detect or counteract police radar. Section 736.2 bars using such a device, or having one in an automobile, in the District. Section 736.3 exempts vehicles and equipment of the U.S. Armed Forces. Because possession alone is enough under § 736.2, the D.C. rule reaches further than Virginia's on that point; the text as read contains no defense comparable to Virginia's no-power-source exception. The District of Columbia Court of Appeals upheld the rule against a claim that the federal Communications Act preempted it in Smith v. District of Columbia, 436 A.2d 53 (D.C. 1981).

The regulation states no penalty. Secondary sources claim a fine of up to $300 plus confiscation of the device; that figure was not found in the District's published regulations and remains unverified. The official text is available from D.C. Regulations.

Commercial vehicles: the federal ban and the New York and Illinois rules

For trucks and buses the answer does not depend on the state. 49 CFR 392.71 bars a driver from using a radar detector in a CMV or from operating a CMV equipped with one, and it bars a motor carrier (the company that operates the vehicle) from requiring or permitting either. The definitions in 49 CFR 390.5 make the rule wider than many drivers assume. A CMV includes any vehicle of 10,001 lb GVWR or GCWR or more in interstate commerce, not only tractor-trailers. A "radar detector" includes devices that detect radio microwaves, laser beams or future speed-measurement technology. The only exception is a device located outside the driver's compartment and completely inaccessible to the driver, so an unplugged detector in the cab is still covered. The rule text is on eCFR.

Two states add their own rules, and both are frequently misreported as passenger-car bans. New York Vehicle and Traffic Law § 397-a bars a radar or laser detector in any motor vehicle with a GVWR over 18,000 lb and in any commercial vehicle with a GVWR over 10,000 lb. A detector connected to a power source and in operable condition is presumed to be in use, a presumption the driver may rebut, and the fine is $25 to $100. Illinois, under 625 ILCS 5/12-714, bars operating a commercial motor vehicle equipped with a radar detector unless the detector is in a locked opaque box, or outside the passenger compartment and not operating. The minimum fine is $50 for a first offense and $100 after that, and the device is seized on a repeat conviction. Neither provision applies to a passenger car.

Federal civil penalties are far higher than either state's fines. Under 49 CFR Part 386, Appendix B, as read in October 2026, the maximum for a driver is $4,812 and the maximum for a carrier is $19,246 per violation. Those are inflation-adjusted ceilings, not typical assessments.

Windshield mounting: legal to own, restricted where it sits

A detector can be legal while its mount is not. The stricter windshield statutes are worded to reach any object or material placed on the windshield that obstructs or reduces the driver's view: Arizona § 28-959.01, California § 26708, Minnesota § 169.71, Texas § 547.613, Louisiana R.S. 32:361.1 and Maryland § 21-1104. Narrower statutes in Florida, Idaho, Kansas, South Carolina, Washington and West Virginia reach only a "sign, poster or other nontransparent material" that obstructs the view.

California and Minnesota

Each lists permitted items and leaves radar detectors off the list. California § 26708(b) allows signs, stickers and other materials in a 7-inch square in the lower corner farthest from the driver or a 5-inch square in the corner nearest the driver, plus portable GPS units in those squares, toll devices in a 5-inch square at the top center and video event recorders. Minnesota § 169.71, subd. 1(a)(2), bars any object suspended between the driver and the windshield except sun visors, mirrors, safety-monitoring equipment near the mirror, GPS or navigation units near the bottom of the windshield, toll devices and certain ID devices. Neither state bans radar detectors; both restrict where one can be mounted.

Texas, Ohio and Georgia

Texas § 547.613(a)(1) makes it a misdemeanor to drive with an object or material on the windshield that obstructs or reduces the operator's clear view, and its exceptions contain no corner-square, GPS or toll-device allowance. California's corner rule does not carry over to Texas. Ohio moved the other way: R.C. 4513.24(B)(2), effective April 3, 2023, allows electronic devices in a passenger car's windshield if they leave sight lines clear and do not conceal the VIN. Georgia § 40-8-73 permits a windshield mount for a "stand-alone electronic device" placed to minimize obstruction; whether a radar detector meets that definition turns on § 40-6-241, which was not confirmed.

In the strictest states, the code text points to dash or visor placement rather than the glass. Several states also limit how the rule is enforced: in Illinois, New York, Nebraska, South Dakota and Virginia an officer may not stop a car solely for the windshield violation, and Maryland applies the same limit to items hanging from the mirror.

Military installations

Military bases set their own traffic rules. The joint Department of Defense traffic regulation (AR 190-5, OPNAV 11200.5D, AFI 31-218(I), MCO 5110.1D and DLAR 5720.1, dated May 22, 2006) contains no detector ban, and neither does its codified version, 32 CFR Part 634. It requires each installation commander to publish an installation traffic code, and the bans appear there.

Fort Leavenworth's installation regulation (CAC and FLVN Reg. 190-5, 2026) bars operating a vehicle while using a radar or laser detection device or a jamming device, and it requires the device to be removed from the windshield or dash. Fort Huachuca's FH Regulation 190-5 (April 12, 2018), para. 18(a), states that radar and laser detector devices "are prohibited on any DoD installations" and may not be openly displayed. A DoD-wide ban attributed to DoD Instruction 6055.04 is cited in reference sources, but that document could not be retrieved, so the department-wide rule is unverified. The installation's own traffic code is the document that governs on each base.

Frequently asked questions

Sources

• Virginia General Assembly (Legislative Information System) — Code of Virginia § 46.2-1079 Radar detectors (current as of 2026, Statute (HTML))
• eCFR / FMCSA — 49 CFR 392.71 Radar detectors; use and/or possession (1993 (current as of 2026), Statute (HTML))
• eCFR / FMCSA — 49 CFR 390.5 Definitions (current as of 2026, Statute (HTML))
• Illinois General Assembly — 625 ILCS 5/12-714 Radar detectors (current as of 2026, Statute (HTML))
• dcregs.dc.gov/Common/DCMR/SectionList.aspx?SectionNumber=18-736
• nysenate.gov/legislation/laws/VAT/397-A
• revisor.mn.gov/statutes/cite/169.71
• codes.ohio.gov/ohio-revised-code/section-4513.24
• armypubs.army.mil/epubs/DR_pubs/DR_a/pdf/web/r190_5.pdf
• home.army.mil/huachuca/application/files/9515/8655/8315/FH_Reg_190-5_Motor_V…