Here is the problem with red light cameras - they do not ticket the person driving the car - they ticket the registered owner. Basically, here in GA, the camera takes a picture of the tag, and they send the ticket to the person who owns the car - not who was actually driving. The problem with this approach is that the enforcement is not being made upon the person who broke the law.
Of course, with any law there are provisions of exclusivity. Since there is no officer to verify that you were the driver, you only have to claim that you lent the car out, and you were not the driver. The judge of course will ask who the driver was, and of course you would state that you lend your car out a lot and it could have been any of several people. Because the vehicle is not a commercial vehicle, you do not have to legally keep a log book, and would not know. Based upon the current law, the charges should be thrown out.
Here's the catch though: The ticket is a non-moving violation, and in most municipalities, it is only around $70. It will cost you more to take off from work to fight it, than to just pay it. I could have beat it when my wife got one in Lilburn (it got sent to me), but I would have lost money that day.
http://law.onecle.com/georgia/40/index.html