In which U.S. states is it illegal to use a radar detector?

Radar detectors are banned in Virginia.
Radar detectors and radar jammers are illegal in the District of Columbia.
Radar jammers are illegal in Oklahoma, but radar detectors are legal.
In New York, radar detectors are illegal for commercial vehicles over 18,000lbs.
In IIlinois, radar detectors are only regulated in commercial vehicles.

Radar detectors are illegal to use or have in vehicle in Canada. They will take it from you and give you a ticket with a fine from $100.00 to $1000.00.

Illegal in Tennessee.

United States Law varies from state to state, but detectors are generally legal in private vehicles under the Communications Act of 1934[15] and illegal in commercial vehicles by DOT regulation (49 CFR 392.71). Exceptions:

Illegal in all vehicles: Virginia, Washington D.C., U.S. military bases

Illegal in commercial vehicles under state law: Illinois, New York, New Jersey (specifically, commercial vehicles over 10,000 pounds (4,500 kg) and all vehicles over 18,000 pounds (8,200 kg)) Also illegal in all commercial vehicles over 10000lbs under US federal law

Indirectly illegal (Illegal due to prohibitions against affixing items to windshield - "obstructing vision"): Minnesota, California[1], New York[16]
Repealed: Connecticut (repealed in 1992)[17]

Confiscation and/or destruction of the detector was once a common practice but lawsuits raised by drivers arguing violation of property rights have resulted in temporary removal while a citation is written, then return of the device after its description (make, model and serial number) has been entered on the ticket - usually for speeding and possession/operation of detector

Radar detectors are highly RECOMENDED in Minnesota.
Specially in Blaine MN.

Igor

The following website states that RADAR DETECTORS are legal but not recommended.
http://find.ohio.gov/search?q=are+radar+detectors+legal&site=&btnG=Search&entqr=0&output=xml_no_dtd&sort=date%3AD%3AL%3Ad1&client=ohio_gov&ud=1&spell=1&oe=UTF-8&ie=UTF-8&proxystylesheet=ohio_gov

Not only are radar detectors illegal to use in Virginia, they're also illegal to have in the vehicle.

The website provided by Phine states that radar detectors ARE LEGAL in Ohio but not recommended.

According to the National Conference of State Legislatures, radar detectors are banned in all vehicles in the state of Virginia and the District of Columbia, Washington D.C. Radar Detectors are also banned in big trucks in the states of New York and Illinois. Plus, under federal law, the use of radar or laser speed detectors is illegal in all commercial vehicles over 10,000 pounds. However, radar detectors are allowed in all noncommercial vehicles in all other states.

Radar detectors are also illegal in Ohio.