I use a very simple "cloaking device" which is comprised of an white bedsheet (king size, 50% polyester to ward off rain, 50% cotton to prevent abrasing my cars exterior finish) which I tie with a thin cord around my car to give it a ghost-like appearance and then nobody can see me! I also poke two holes in the sheet in the windshield so I can see where I am driving.
I have also packed aluminum foil balls and scotch-taped them onto my rims, which acts as a reflector to any oncoming radar and laser beams and redirects them to other cars on the road. That works well, but I would recommend using a very resistant tape in rainy weather.
I agree entirely with Sam---very good point. Don't give the trooper any reason to feel threatened or endangered. Make his job easier. I have been stopped MANY times. I would even recommend that if you KNOW you have been tagged, pull over to the side, the shoulder immediately, and wait for the officer to pull up behind you. I have done this many times, and the cops are either shocked, surprised, or actually laugh about it. It sounds radical to admit to "speeding", but then the trooper doesn't have to waste time chasing you, and will make his job easier. You will be surprised how far honesty will get you. I will tell you this has always gotten me off with just a warning.
If that doesn't work, keep a can of warm cream soda and a bag of barbecued potato chips in your glovebox. Before he gets to your car, grab the bag of chips, open the soda, chew everything as quickly as you can, roll your eyes and head, and make believe you are possessed or having convulsions, as you let the chips and cream soda froth from your mouth. Also don't forget to gibber in some foreign tongue. Nobody will come near you.