"License plate privacy screen" yields about 900,000 hits on google.
http://community.discovery.com/eve/foru ... 3211963678
Doesn't have too much to do with privacy screens/foiling the camera, but the one thing that people here used to combat the van cameras was a good pair of binoculars.
Yes, the passenger would look far down the road using a pair of binoculars and tell the driver to slow down when he saw one of the white vans off on the side of the road.
Kinda low-tech, but worked much better than any of the other techniques, and legal too.
Nothing beats Johnny Law as often or consistently as a good set of eyeballs.
Obscuring a license plate is almost universally illegal.
However, I have seen advertised an liquid crystal screen for license plates. Normally it just looked like a clear plastic cover, but you could flip a switch to energize the screen and it would become opaque. Ostensibly it was for use at car shows and cruise-ins with many warnings about not being for highway use, but you know why it was really invented...
There are sprays that supposedly reflect the glare of a stoplight camera flash to obscure plates. There are also plastic covers that are contoured so that they obscure the plates from above, but not from either side or straight on.
Bottom line: Cop sees that you're trying to obscure your plate, you'll get a ticket.
Dude, considering all the trouble you've had with the law recently, you probably ought to drive a Buick Century.