As for detecting a jammer when it is being shot:
Separate laser jammer detectors do exist:
http://www.ottery.com/LJD%20A5.pdf
IMHO, a separate laser jammer detector is at a disadvantage because it doesn't know how the gun's pulses are timed. Also it might be difficult for it to discern between valid reflected pulses from the gun and actual jamming pulses.
The regular jam code feature in most laser guns should be adequate for most situations, and has the advantage of knowing how the gun's pulses are timed.
As far as a jammer being detected when it isn't being shot:
Some of the laser diode jammers do pulse every so often to keep the laser diode warmed up and for the parking sensor feature. They
could make a detector for that, but of course it would probably be detecting a lot of valid devices, like parking sensors, laser cruise control, etc....
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