The way the stationary cameras in AZ work, is with coils embedded in the road, with two cameras. One camera takes a pic of the rear (only, on most cars here) plate, and the other takes a pic of the driver. If you, as the owner of the vehicle, can show that your drivers license photo is not the same as the driver in the pic with the ticket, they dismiss it. They can't make you divulge the identity of the actual driver. (The case I am familiar with was my best friend's step son).
Also, the reason the state decided to discontinue the practice was that it cost too much money. I suspect Redflex, the contractor, got a payment from the state for every ticket they issued, whether paid or not. Talk about a conflict of interest!
In all fairness, the cameras on Hwy 69 DID slow down traffic, even if only for a short stretch. People were routinely going 70-75 MPH in a 55 zone.