Communications Act of 1934[17] 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[18]
Repealed: Connecticut (repealed in 1992)[19]
NOTE: They shouldn't confiscate
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. Use of a radar/lidar detector on a military installation is prohibited. Persons entering a military installation with one visibly mounted to the sun visor or windshield will be asked to remove it and put it away. Those who refuse will be denied entry onto the installation at that time. Military law enforcement may not soley stop a vehicle for a detector being in use but, along with being stopped for another moving violation, the person using the detector may be ordered to report the violation to his/her unit commanding officer (active duty ONLY). No traffic citation may be issued against military dependents, civilian workers or retired persons even if the military installation is in a state or district which prohibits the use, possession and/or transportation of such devices. Military law enforcement cannot enforce civilian ordnances, state laws, etc.
Here in cali i forgot to put it away going to work on base once...they stopped me and tried to give me a ticket, I showed the PMO the regulation and this...he didnt give me the ticket and let me know..." well since I cant cite you, either put it away or I can escort you off base"...