There has only been one case (in Wales I believe) of someone getting done for this, what happened to him I have no idea (hardly crime of the century!)
I dont think its correct that some laser guns will warn that they are being jammed but I may be wrong. Also there are a lot of reports that the LRC-100 can be used as a garage door opener, I have been told by a dealer that this is a myth! Unlucky as I have an electric garage door and this could have been the ideal excuse.
As for taking them out I dont think that this would be a 5 mnute job, as the positioning/leveling of the jammer is critical so Its not something that you would want to do unless you really had to, if you have the B2 or Road Angel you can link the jammer up to them, this will also act as the LED and speaker and will provide power to the jammer.
My argument would be that they are openly sold at numerous outlets with no reference to them being illegal, that said even if you did jam their signal do you honestly think that they could be arsed with pursuing it? Finally it only jams for 5 seconds, bearing in mind the distance involved they will get another reading from your car, by which time you should have slowed down enough to be within the speed limit........ Im getting one as soon as I can negotiate the best deal!