There was a guy in Pheonix that put on a hallowen monkey mask and purposedly chalked up almost 40 camera speeding tickets. He beat all of them in court because a judge ruled that although it could be proven it was his car, there was no proof it was him driving.
See artcle here: http://www.azcentral.com/news/articles/2009/09/08/20090908dpsmonkey0908.html
I would imagine that the same would hold true for redlight cameras.
So why didn't they pull him over and give him a ticket, then? He's going to beat that one too.