Are radar detectors legal? The 2026 guide

The three rules that actually matter

• State bans: Virginia and Washington, D.C. prohibit radar detectors in all vehicles. Police can issue a citation and confiscate the device.
• Federal commercial rule: detectors are prohibited in commercial motor vehicles rated over 10,000 lbs GVWR, in all 50 states, whatever the state code says.
• Federal property: detectors are prohibited on US military installations, whatever the host state allows.

Beyond those three, state law mostly concerns how you mount the device rather than whether you may own it. Several states restrict objects attached to the windshield; where that applies, a dashboard mount keeps you clear of a separate obstruction citation.

Legality by US state

Select your state for the specific rule, mounting guidance, how enforcement is typically conducted there, and what happens if you are stopped.

Windshield mounting restrictions

These states restrict objects attached to the windshield. Detectors remain legal there — the restriction is about obstruction of view, so mount on the dashboard and the issue disappears: Arizona, California, Connecticut, Minnesota, Nevada, New Jersey, Pennsylvania, Texas, Utah, Washington.

Penalties in banned jurisdictions

Outside the United States

Detector law changes dramatically at every border, and in Australia at every state line. We keep a dedicated, sourced guide for each of our main markets.

Detector vs jammer — an important distinction

A radar detector is a passive receiver: it listens for radar and laser emissions already in the air and tells you about them. A jammer actively transmits a signal designed to defeat police measuring equipment. That difference is the whole reason detectors are broadly legal and jammers are not — and it is why any listing advertising "undetectable" or "jamming" capability should be treated as a warning sign. Read the full comparison.

Crossing borders with a detector

• Driving into Virginia or D.C. from a legal state: unplug the unit and stow it out of sight before you cross.
• Entering Canada: check the specific province — several prohibit detectors and border officers may seize devices.
• Flying with one: pack it in hand luggage where practical and check the destination's rules first.
• Hire cars abroad: the local law applies to you as the driver, and rental terms may add their own restrictions.