Just a couple of thoughts......
I've decided to jump in here only to give some sound words of wisdom that can save someone from a citation. Usually a person has to lend credibility to themselves and it becomes a long list of ...I did this...and I did that. All that is really needed here is that this comes from being assigned to the "Traffic Division" for 5 years. That said;
There are many types of energy emitting devices used to detect the speed of a moving object. For the most part, law enforcement has radar, microwave,laser and photo (not energy emitting), or combinations of these to choose from.
The older units (lot's of them still in use) were the the early K and Ka bands of radar and for the most part, were always "ON", emitting a signal that would bounce all over the place from radar reflective surfaces. This "overspray" was easily picked up by early detectors and really saved a lot of people from tickets. The auto w/ the detector only had to slow down, provided they were not the intended object, and the general public lost their minds and started buying them left and right. Savy electronics firms made millions.
Radar then went to "Instant ON", and that changed things dramatically. Now, the instant that the operator turned the unit on, the "strongest signal" would be displayed in a second display screen and the operator could instantly "lock" that displayed value (speed). The term strongest signal is a whole other discussion w/ rules and caveats, but for our purposes, the strongest signal is usually the "lead" vehicle (closest) which is usually the fastest (yes I know that is not always true...there are ways to discriminate or ignore). For our purposes, by the time the speeding vehicles detector went off, it was WAY too late...that speed had already been captured.
Laser, light-dar or any other combination. these are also "Instant-ON" and captures the speed of the object instantly, IMO voiding the usefulness of the detector unit. Of interest is the fact that these units are sighted...meaning that they have sights on them and can pick you out of a crowded 6 lane freeway regardless of the speed of the surrounding traffic or the SIZE of the surrounding traffic (trucks).
Photo...Passive and merely a function of distance tavelled over time. No detector for that.
Synopsis;
With older radar units, if the operator is "asleep at the wheel" and you have super kung-fu reflexes (or you have good reaction times at the drag strip tree....
), then you MIGHT get it shut down before your speed is locked. ANYTHING else.....it was over the instant your "super-turbo dynomax 9000-multi band mx missile radar jamming" detector went..."ding-Dong"
And they very, very, very rarely come out of calibration and the operator calibrates them at the beginning and end of each shift. Some departments require calibration before and after each citation.
Moral to the story......slow down...use your head...think about where you are.....
or make damn sure you know what you are doing when you decide to flex your 600 hp super-toy.
I have never had or will have any type of detector...IMO they are a wast of money.
Regards,