You would need to damp all radio and microwave signals to be truly out of sight
With all due respect, Noo, I think you over complicate the issue. One of the problems with the volume of information that traffic cams, stoplight cams, et. al. can provide is that there is just too much information generated to be processed for piddly stuff. Low tech solutions to interpersonal disputes can still be very helpful in resolving the issue.
Yes, Mr. Death... I'll play you a game! But not CHESS !!! BAH... FOOEY! My game is...
WIFFLEBALL!
I have one of these mounted behind the rear view mirror connected to a 12v to 5 v transformer in the head liner which is powered when the ignition is on
http://www.ebay.co.uk/itm/HD-720P-In...item19e89b5b21