My suspicion is either what Mark said about the small window..
^^ this. Laser 'beam' is just 3' across at 1000'. If they hit your plate, there is a good chance that you won't know about it. Even if you do, it's too late.. by the time your detector goes off, the cop has his reading.
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Check local laws concerning ownership/use of laser and/or radar jamming equipment. In MN, it's a big no-no to Jam. My friend (AtomicZ) got pulled over in his Gallardo for unknowingly jamming the local State Patrol. (he had recently purchased the car and didn't know the system 'jammed'). Officer made him disable the system on the side of the road and subsequently turn the system hardware in within 10 days (aka confiscation). YMMV.
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