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Quick answer: Radar detectors are legal in every U.S. state for passenger vehicles except Virginia and Washington, D.C., where they are illegal to use. On top of that, radar detectors are banned nationwide in commercial vehicles rated 10,001 lbs or more and on all military bases. California and Minnesota allow them but prohibit mounting them on the windshield.
Where Radar Detectors Are Illegal
For everyday passenger vehicles, there are only two places in the United States where using a radar detector is against the law:
- Virginia: Illegal under Va. Code § 46.2-1079. The statute prohibits operating a vehicle equipped with a detector, so simply having one in the car can earn a ticket — switching it off is not a defense. There is one narrow exception: you are not in violation if the device (1) has no power source connected and (2) is not readily accessible to the driver or any passenger. In practice that means unplugged and in the trunk — unplugged in the glovebox still violates. Virginia also prohibits the sale of radar detectors in the Commonwealth. The offense is a traffic infraction, not a criminal charge, and carries no DMV demerit points.
- Washington, D.C.: Illegal under 18 DCMR § 736. D.C. is stricter than Virginia — the rule bans use, possession, and sale (§§ 736.1–736.2), and there is no published exception for a detector that is unplugged and stowed. Violations carry a fine of up to $300 plus confiscation, and the rule applies to vehicles merely passing through the District. The only exemption is for U.S. Armed Forces vehicles and equipment (§ 736.3).
The Mississippi Myth
You will often see Mississippi listed as a state where radar detectors are banned. This is incorrect. The confusion comes from a Mississippi statute that regulates the use of radar speed-detection equipment by law enforcement — not consumer radar detectors. Radar detectors are legal for use in passenger vehicles in Mississippi.
Windshield Mounting Restrictions (California & Minnesota)
Two states allow radar detectors but restrict where you can mount them, under general windshield-obstruction laws:
- California: Legal, but the detector cannot be mounted on the windshield. Mount it on the dashboard instead.
- Minnesota: Legal, but nothing may be affixed to the windshield — mount the detector on the dash.
Several other states have general laws against obstructing the driver’s view, so a dashboard or vent mount is always the safest choice.
Commercial Vehicles: Banned Nationwide
Under federal law (FMCSA regulation 49 CFR 392.71), no driver may use or even possess a radar detector in a commercial motor vehicle rated at 10,001 lbs or more, in any state. Having one in the cab — even switched off — is a violation, and penalties can include fines starting around $2,000 and out-of-service orders.
Military Bases: Banned Everywhere
Federal law prohibits the use of radar detectors on all U.S. military bases, regardless of the state the base is in. Expect your detector to be confiscated if it is found powered on at a base gate.
Radar Detector Laws by State (2026)
Radar detectors are legal for passenger vehicles in every state below except where noted. Commercial-vehicle and military-base bans apply nationwide regardless of state.
| State | Passenger-Vehicle Status |
|---|---|
| Alabama | Legal |
| Alaska | Legal |
| Arizona | Legal |
| Arkansas | Legal |
| California | Legal — not on windshield |
| Colorado | Legal |
| Connecticut | Legal |
| Delaware | Legal |
| Florida | Legal |
| Georgia | Legal |
| Hawaii | Legal |
| Idaho | Legal |
| Illinois | Legal |
| Indiana | Legal |
| Iowa | Legal |
| Kansas | Legal |
| Kentucky | Legal |
| Louisiana | Legal |
| Maine | Legal |
| Maryland | Legal |
| Massachusetts | Legal |
| Michigan | Legal |
| Minnesota | Legal — not on windshield |
| Mississippi | Legal |
| Missouri | Legal |
| Montana | Legal |
| Nebraska | Legal |
| Nevada | Legal |
| New Hampshire | Legal |
| New Jersey | Legal |
| New Mexico | Legal |
| New York | Legal |
| North Carolina | Legal |
| North Dakota | Legal |
| Ohio | Legal |
| Oklahoma | Legal |
| Oregon | Legal |
| Pennsylvania | Legal |
| Rhode Island | Legal |
| South Carolina | Legal |
| South Dakota | Legal |
| Tennessee | Legal |
| Texas | Legal |
| Utah | Legal |
| Vermont | Legal |
| Virginia | Illegal (passenger vehicles) |
| Washington | Legal |
| West Virginia | Legal |
| Wisconsin | Legal |
| Wyoming | Legal |
| Washington, D.C. | Illegal (passenger vehicles) |
Laser Jammers Are a Different Story
Laser jammers (which actively block police LIDAR, unlike radar detectors, which only alert you) are legal under federal law but banned in 11 states: California, Colorado, Illinois, Iowa, Minnesota, Oklahoma, South Carolina, Tennessee, Texas, Utah, and Virginia. Penalties vary widely — Iowa treats it as a $135 civil fine, while Colorado is the strictest, classing it as a Class 2 misdemeanor traffic offense carrying up to 90 days in jail. Sources disagree on Nebraska, so treat it as unsettled and verify locally. Washington, D.C. is ambiguous: its rule (18 DCMR § 736) targets devices that counter police radar, and because it was written in 1961 it never mentions laser or LIDAR — whether it reaches laser jammers has not been clearly settled, so assume the risk is real. Because these laws change, confirm your state before installing one.
Radar Jammers Are Illegal Everywhere
Do not confuse a radar detector (legal almost everywhere) with a radar jammer (an active device that transmits to block police radar). Radar jammers are illegal in all 50 states under federal law — the FCC prohibits them under 47 U.S.C. § 333, and violations can carry fines exceeding $48,000 and criminal charges.
Frequently Asked Questions
Are radar detectors illegal?
No, not in most of the U.S. They are legal for passenger vehicles in every state except Virginia and Washington, D.C. They are, however, banned nationwide in commercial vehicles rated 10,001 lbs or more and on all military bases.
Are radar detectors illegal in Mississippi?
No. This is a common myth. Radar detectors are legal for passenger vehicles in Mississippi; the state statute people cite regulates police radar use, not consumer detectors.
Can I mount my radar detector on the windshield?
In most states, yes. California and Minnesota prohibit windshield mounting — use a dashboard or vent mount there, which is the safest choice everywhere.
Are laser jammers legal?
They are legal federally but banned in 11 states: California, Colorado, Illinois, Iowa, Minnesota, Oklahoma, South Carolina, Tennessee, Texas, Utah, and Virginia. Nebraska is disputed, and Washington, D.C. is ambiguous because its rule predates laser speed enforcement and addresses radar only. Verify your state’s current law before using one.
Are radar jammers legal?
No. Radar jammers are illegal in all 50 states under federal FCC law, with severe fines and possible criminal charges.
Related Guides
Quick answers by state
The short version for the states people ask about most. Everything below applies to private passenger vehicles — commercial drivers are covered by the federal rule regardless of state.
Are radar detectors legal in New Hampshire?
Yes. Radar detectors are legal in New Hampshire for private passenger vehicles, with no state-specific mounting restriction. Commercial vehicles over 10,001 lbs are covered by the federal ban either way.
Are radar detectors legal in Delaware?
Yes. Delaware permits radar detectors in private passenger vehicles. Commercial vehicles over 10,001 lbs are covered by the federal ban either way.
Are radar detectors legal in Wyoming?
Yes. Radar detectors are legal in Wyoming for private passenger vehicles. Given the distances and the 80 mph interstate limits, a detector is legal but no substitute for watching your own speedometer. Commercial vehicles over 10,001 lbs are covered by the federal ban either way.
Are radar detectors legal in Maryland?
Yes. Maryland permits radar detectors — which matters on the I-95 corridor, because they become illegal the moment you cross into Washington D.C. or Virginia.
Are radar detectors legal in Hawaii?
Yes. Radar detectors are legal in Hawaii for private passenger vehicles. Commercial vehicles over 10,001 lbs are covered by the federal ban either way.
Are radar detectors legal in Alabama?
Yes. Alabama permits radar detectors in private passenger vehicles. Alabama does prohibit obstructing the windshield, so mount conservatively.
Are radar detectors legal in Alaska?
Yes. Radar detectors are legal in Alaska for private passenger vehicles. Commercial vehicles over 10,001 lbs are covered by the federal ban either way.
Are radar detectors legal in Vermont?
Yes. Vermont permits radar detectors in private passenger vehicles. Commercial vehicles over 10,001 lbs are covered by the federal ban either way.
Are radar detectors legal in Kentucky?
Yes. Radar detectors are legal in Kentucky for private passenger vehicles. Commercial vehicles over 10,001 lbs are covered by the federal ban either way.
Are radar detectors legal in South Dakota?
Yes. South Dakota permits radar detectors in private passenger vehicles. Commercial vehicles over 10,001 lbs are covered by the federal ban either way.
Are radar detectors legal in California?
Yes, but you may not mount it on the windshield — and unlike dash cams, radar detectors get no exemption from that rule. Laser jammers are illegal here. Full California guide →
Are radar detectors legal in Virginia?
No. Virginia is the only state with an outright ban (Va. Code 46.2-1079), and having one in the car counts — powering it off is not enough. The only exception is a detector that is both unplugged and genuinely inaccessible, such as in the trunk. Laser jammers are illegal here. Full Virginia guide →
Not listed? Radar detectors are legal in every U.S. state except Virginia (and in Washington D.C. they are also banned). Use the table above for the full 50-state view.