Here's some reading material for you, tested BY cops and the people who make radar/laser units. Much retail radar detector packaging space is dedicated to the issue of claiming invisibility to the VG-2. The VG-2, marketed by Kustom Signals Inc., was the first radar detector / detector (RDD). All radar detectors radiate some amount of microwave at a certain frequency. Many times you are driving on the interstate and your detector goes off. You look around for Smokey....no Smokey. It was the radar detector in the opposite lane of traffic keying up yours. VG-2 is looking for microwave, lo (local oscillator) leakage at 11.55 GHz. Detector makers did two things to defeat the VG-2. First they changed their lo frequency. Second, and most clandestine, was to detect the VG-2's microwave leakage, shut down the detector until the threat was passed, and then turn back on the detector. It is called VG-2 Alert or a radar detector / detector / detector. Checkmate right? Wrong! Two years ago a new RDD, the Spectre, landed from Australia. It looked for the expanded detector lo leakage frequencies. Detector makers countered by changing lo frequencies. A new Spectre with a wider lo window has entered the market along with an entirely new RDD, the MD-3 from Hill Country Research. All three RDDs were provided SML by the Texas Department of Public Safety, the state police, for the field evaluation. Texas troopers operated the RDDs and detectors started at a cone placed at 1/2 mile from the RDDs. Test vehicles drove at 30 mph and when detected, the test vehicle was told to stop and its range was determined by a Kustom Pro III laser gun. Also by the way, this was written awhile back and most enforcement agencies ESPECIALLY State and Highway patrol have these.
Here's some more:
Laser is not radar! Laser's one milliradian, monochromatic beam can target one vehicle in a group. Radar can't! Laser's beam is extremely narrow compared to radar and must be reflected back to the laser gun by a reflective surface on the vehicle...first aiming point the license plate and then the headlights. At 500 feet, laser's light beam is a mere 18" wide compared to an X band radar beam of 157 feet. Laser does not "scatter" like radar's bouncing off other vehicles, billboards, or buildings giving you advanced warning. Simply put, there is no advanced warning to laser's use like there is with radar. If you receive a laser warning it usually means you just got a ticket! To prove this point we placed a target vehicle at 1,000 feet and a car behind it containing a radar/laser detector. We first hit the 1,000 foot vehicle with Ka band radar and both detectors alerted. We then fired a Stalker laser gun at the 1,000 foot vehicle's license plate. The front vehicle's detector alerted to laser, the following vehicle's detector was silent! We did this ten times with three different laser guns. The results were identical. The rear vehicle's detector provided no advanced warning to laser.
And something not really related but I've seen it discussed a lot.
Jamming, or attempting to jam a police radar gun is considered a Federal felony punishable with fines up to $75,000 and up to one year in jail, Code of Federal Regulations, CFR 95:422a. According to the Federal Communications Commission, Technical Rules Branch, "both active and passive jammers are illegal and punishable with fines and, in some cases, jail time. Manufacturers as well as jammer owners are culpable. You can not interfere with radio signals." I don't want your arguments here. Many products claim dramatic weight loss without exercise or diet. Coronado looked for the "Seven Cities of Gold." We still haven't found the "Fountain of Youth." Let's leave the Easter Bunny alone. See www.fcc.gov
and enter key word "jammers." Ask them if jammers are legal. You can say anything on a package or on the phone. Due to lack of Federal enforcement of radar jammer regulations, an increasing number of states have enacted their own bans on radar jammers, i.e. California, Utah, Nebraska, Oklahoma, Virginia, North Carolina, Minnesota, Indiana, Washington D.C. We have been testing radar jammers for over ten years. In the words of P.T. Barnum of Barnum and Bailey Circus... "there is a sucker born every day." If you buy a "passive jammer" you are that sucker! Good luck with your speeding tickets and the guarantee that guarantees to pay them. We have found only one, that's right ONE, active radar jammer to work. It only works on X and K bands.