The reason jamming is not feasible is that you have to broadcast into all directions, reducing the power aimed at the lidar gun. Unless you actively steer this jamming signal towards the police lidar gun, it will only be an effective jammer at ranges farther than about 200 meters for a jamming signal broadcast into .005 steradians. For anyone who gets a laser ticket, we encourage you to fight it. The prosecution teams around the country are glad you don't know that. When something has been given judicial notice, it means that the theory of operation has been proven to the court and expert testimony to prove that is no longer needed.
Radar is one such example.
Aircraft speed traps are another. As it so happens, we at NMA keep a list of experts for our members, and one of those categories just happens to be radar and speed measurement devices. The vibrations would scatter the beam everywhere. I've only been ambushed by a laser trap once, and the setup had one officer doing the laser, another next to him radioing the to the chase vehicles, and 4 or 5 chasers. Theoretically the same should happen with laser traps, but don't count on it until someone says something.