I have the laser interceptor on my car. In georgia you can be legally laser speed checked from about 1/2 mile away. The trick is when the jammer goes off get down to the speed limit and turn off the jammers and allow the cop to get your speed (at a legal level) and drive by him smiling. At a half mile your car is the entire size of the laser dot on his display and he will generally assume he did not have a good signal hit. The cop also must be stationary to run laser.