Detector rules cannot be reduced reliably to an undated country or state list. The place, type of vehicle and exact device matter. This page gives two documented US examples and a method for checking the rest; it is not a comprehensive legal opinion.
Virginia
Virginia Code § 46.2-1079 prohibits specified detection and interference devices in vehicles operated on the Commonwealth's highways, subject to the statute's terms and exceptions. Read the full current section rather than relying on a retailer's summary.
The statutory treatment is broader than a simple claim that the device was switched off. If your circumstances are uncertain, obtain appropriate legal guidance before carrying or using the equipment.
US commercial motor vehicles
FMCSA's Safety Planner summarizes 49 CFR 392.71: a driver may not use a radar detector in a covered commercial motor vehicle or operate one equipped with or containing a detector. The agency identifies its planner as guidance, so the underlying regulation governs.
Do not apply a passenger-car discussion to a commercial vehicle without checking the relevant definitions and rules.
Build a journey-specific source list
List each jurisdiction on the route and identify the vehicle category. Search the relevant legislature, transport regulator or police authority for the current rule. Record the section number, effective date and official link. Check mounting and distracted-driving requirements separately rather than assuming that device legality settles installation.
If information conflicts, favor the current official text and seek clarification from the appropriate authority. A forum post or a seller's shipping policy does not settle whether use is lawful.
Keep the device categories distinct
A receiver and a device intended to interfere with measurement are different categories. Do not infer that a rule about one permits the other. This publication does not offer interference-device advice.
This page was reviewed on September 30, 2026. Laws and their interpretation can change. It does not certify a proposed installation or route, and safe driving and posted limits remain the driver's responsibility.