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: It is illegal to operate a powered radar detector in a vehicle. You may legally own one, and simply possessing an unplugged, stored detector (e.g., in the trunk) is not a violation — but using it while driving is prohibited.
- Washington, D.C.: Radar detectors are illegal to use in any vehicle within the District.
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 block police LIDAR, unlike radar detectors, which only alert you) are legal under federal law but banned in roughly a dozen states. States that prohibit laser jammers commonly include California, Colorado, Illinois, Minnesota, Nebraska, Oklahoma, South Carolina, Tennessee, Texas, Utah, and Virginia, plus Washington, D.C. Penalties range from small fines to, in a few states, misdemeanor charges. 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 about a dozen states (including California, Texas, Virginia, and others) plus D.C. 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.
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