It depends....Originally Posted by Deaf Pimp
http://www.valentine1.com/laserhowto/
The pencil-thin beam of the laser gun expands with distance. The actual beam is only several feet wide at 500 feet, but "aiming wobble" introduced by the human holding the bulky gun make the detectable beam at least three times larger. Even without the wobble, it covers most of the roadway after a mile. This means it is actually much easier to find a fragment of the beam at greater distances from the laser trap. At short ranges, the beam may be so concentrated that a detector mounted away from the aim point on the vehicle may not be able to pick up enough stray energy to activate an alarm.




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