I gather laser jammers are kind of fun, and effective, though! Too expensive for me, but do the job - legally.

According to radartest.com , laser jammers mostly don't work. They found one that did, I think.

Edit: Ah, I just checked. I was wrong, they all work, but the cop has to aim his laser exactly at your jammer in order for it to work. Only one of the units was powerful enough to cover the whole front of the vehicle.
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Tony Fabris