Radar Detectors

[Fish]

It might be possible?, but only if there was a huge distance between the cars and the officer (the beam gets wider the farther out it goes). At normal distances, the beam is so focused that you wouldn't even know it if the car next to you were tagged. Infact I've heard of a police officer purposefully try to set off a laser detector and the only way he could do it was to shoot the detector itself (not the car). Also, the laser is not on all the time just waving around like a radar. Only when the officer pulls the trigger does it send out two pulses - and they are measured in milliseconds.