What the lookup shows Choose any of the 50 states or the District of Columbia and the lookup returns four fields for that jurisdiction: whether a radar detector is prohibited in a passenger vehicle, the statute that governs objects mounted on the windshield, the status of laser jammers, and the citation behind the detector finding. The four fields come from two research tables compiled for I Go Cars in October 2026. One records radar detector law and windshield rules for all 51 jurisdictions; the other records laser and radar jammer statutes for the same 51. Each row was built from statute text, read on the official legislature or code site wherever it could be reached and on a mirror such as Justia, FindLaw or public.law where it could not.
Passenger-vehicle status
This field answers the question most readers arrive with. Only two jurisdictions prohibit radar detectors in private passenger vehicles: Virginia, under Va. Code § 46.2-1079, and Washington, D.C., under 18 DCMR § 736. The District's rule is a municipal regulation that dates from a 1961 Commissioner's Order; it is not a section of the D.C. Code. Every other state shows “No statute prohibits.”
Windshield statute
This field summarizes the section that controls what may be placed on or behind the windshield, and it notes where the text was read. In 34 jurisdictions the official text was read directly. In 12, the reading came from a mirror or an older edition, such as the 2006 Justia edition of Alabama's statute. In five (Mississippi, New Mexico, Oklahoma, Tennessee and Wisconsin), the statute could not be retrieved at all, and the lookup says so instead of supplying a commonly cited section number.
Laser jammer status and citation
The jammer field takes one of three values: banned by a statute that names laser or lidar or covers any police speed-measuring device; radar jamming banned by a statute that does not name laser; or no statute found. The citation field gives the section that creates a detector prohibition where one exists, together with any state truck rule.
How to read “no statute prohibits”
For 49 jurisdictions, legality rests on an absence. Researchers looked for a prohibiting statute and did not find one, and that finding is consistent with standard secondary references that list Virginia and the District as the only passenger-vehicle bans. No state government page affirmatively declaring detectors lawful was found. Complete full-text searches of the vehicle code were run for only a handful of jurisdictions, among them Wyoming, Minnesota, Oregon and the District. Confidence in these rows is therefore recorded as medium, not high. “No statute prohibits” means that no prohibition was located; it does not mean a legislature has granted permission.
Why the windshield statute usually matters more
In 49 jurisdictions the detector itself is lawful, so the rule a driver is most likely to meet is the one about where the detector sits. Windshield statutes fall into two broad families. The stricter family reaches any object or material placed on the windshield that obstructs or reduces the driver's view; Arizona, California, Minnesota, Texas, Louisiana and Maryland use wording of this kind. The narrower family reaches only a “sign, poster or other nontransparent material” that obstructs the view, the formula used in Florida, Idaho, Kansas, South Carolina, Washington and West Virginia.
Details inside each family change the answer. Some states carve out measured zones, such as Arizona's 7-inch square in the lower corner farthest from the driver or Nevada's 6-inch square. Ohio allows electronic devices in a passenger car's windshield if they do not restrict sight lines. California and Minnesota list permitted items, including navigation units and toll devices, without naming radar detectors. Several states, including Illinois and New York, make the windshield rule a secondary offense, meaning an officer may not stop a car for that violation alone. A detector that is legal to own can still produce a citation because of where it is mounted.
How jammers differ from detectors
A detector is a receiver: it listens for police radar or lidar and warns the driver. A jammer transmits, aiming to corrupt the reading. Radar jammers are illegal in every state under federal law, because the Federal Communications Commission prohibits marketing, selling and operating devices that interfere with authorized radio services, police radar among them. Laser jammers emit infrared light, and the FCC defines radio waves as frequencies below 3,000 GHz, so its rule does not reach them. The federal laser product standard administered by the Food and Drug Administration governs product safety, not whether a driver may use the device. The status of laser jammers therefore depends on state law: 11 states ban them by statute, Nebraska and the District ban radar jamming in text that does not name laser, and in the remaining 38 states no statute was found, which is not confirmation that the devices are lawful.
Commercial vehicles and military installations
The lookup reports passenger-vehicle rules. Commercial drivers answer to a separate federal regime. Under 49 CFR 392.71, no driver may use a radar detector in a commercial motor vehicle or operate one equipped with a detector, and no carrier may permit it. The definitions in 49 CFR 390.5 set the threshold at 10,001 pounds and extend “radar detector” to devices that detect laser beams; the only exception is a device outside the driver's compartment and completely inaccessible to the driver. Illinois (625 ILCS 5/12-714) and New York (VTL § 397-a) add state bans of their own, and the citation field shows them.
Military installations are another layer that no state row captures. The joint Department of Defense traffic regulation (AR 190-5, 2006) contains no detector ban, but installation traffic codes do. Fort Leavenworth's 2026 regulation bars driving while using a radar or laser detector or a jammer and requires removal of the device from the windshield or dash, and Fort Huachuca's regulation prohibits detectors on the installation. A Defense Department instruction that secondary sources cite for a department-wide ban could not be retrieved and remains unverified.
What the lookup does not tell you
The lookup reports state statutes and the District's regulations. It does not survey county or city ordinances. It cannot predict how a particular officer or court will apply a statute: whether a detector counts as a “similar electronic device” under Ohio's windshield exception, for example, or whether a given mounting position “materially” obstructs the view under Illinois law. Those are questions of interpretation that the statute text does not settle. Fine amounts appear only where a section states them; Virginia's detector section, for instance, sets no fine of its own. Rows drawn from older editions or mirrors may not reflect amendments, and any statute can change after the date it was read.
When the data was checked
Every row was researched and checked in October 2026, with the final pass completed on October 29, 2026. The lookup describes what statutes and regulations said on that date; it is not legal advice, and I Go Cars is an automotive publisher, not a law firm. Anyone relying on a row should open the cited section on the legislature's own site and read the current text.