LASER works by sending a light signal to the target instead of microwaves.
From the Valentine One website (by FAR the most comprehensive RADAR and LASER receiver available):
http://www.valentine1.com/v1info/laserdefense.asp
The pencil thin beam used by LASER requires that the officer hold the device DEAD STILL.
It’s arguable that issuing a deserved speeding citation using LASER is much more difficult.
@gorillapaws LASER devices do provide visual feedback to the fascist pig, I mean officer.
Note that a quick reaction to a LASER warning is vital.
It should also be noted that in the operation manual for many speed detection devices there is a disclaimer that states in so many words that the product is not recommended for vehicle speed detection.
Do your homework before contesting a citation in court.
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All while Germany has sophisticated equipment that measures a FAR more important aspect of safe driving:
Proper space between vehicles fore and aft. Ugh…