This question is probably for Jim, or maybe DS can ask his engineers.
What is to stop a laser gun mfg from having the gun emit its pulses at random intervals? This would make it impossible for a jammer to predict when the next one was coming so the current approach to jamming would be useless (look up table or sync). The time of flight is so short compared to the interpulse interval that there is a huge amount of time to play with and still keep the average pulse rate high enough to get reliable speed readings (as reliable as any laser gun anyway).
The only way I see to jam such a gun would be to emit a high frequency, randomly timed set of pulses, but that would be a very clear signal to the gun that it was being actively jammed and would, I think, be able to generate an error code that would rarely occur falsely. Thus, such a jammer would be useless where they are illegal and highly suboptimal even where legal.