It has a lot to do with the situation and location. Radar detectors basically detect the beam that the radar gun puts out and warns you that it is in use in the area. The old guns put out a lot of energy with a big cone and are more easily detected. The newer laser guns have a smaller more accurate beam so they are harder to detect. If a cop is sitting around a corner waiting with the gun off then as you come around he points the gun at you and pulls the trigger, you are caught and no radar detector in the world is going to help you. If he is just sitting there with the gun on and it is constantly shooting the beam so he hits every car that comes down the street you would have a chance and detecting the beam before you entered into it.
It is much harder to detect the laser guns than the old guns so really the detectors don't help all that much.
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