+1 for Arizona on many accounts:
Arizona law requires that citations be delivered by person of official capacity within so many days. Without the resources for the state to do this, most people just ignore the automatic mailed ones, or make themselves unavailable if someone knocks on the door, and nothing comes of it. As a result, it's come to light that the cameras being unenforceable cost far more than they generate and many are being shut down. This of course has also drawn the ire of many in AZ, as it genuinely proves that the cameras were entirely for revenue and had nothing to do with safety. AZ has been against cameras for a while, they only started here because our lefty authoritarian totalitarian ex gov single handled requested them via executive order against the vote of the state congress (which she has done on many occasions).
Also, details are fuzzy at the moment, but I'm pretty sure Arizona law requires that a LEO witness an infraction for a citation to be valid (possible that having a real LEO inspect pictures/video before allowing the citation to go out from these cameras meets this requirement).
Arizona law, IIRC, holds the owner accoutable for the vehicle, so if you are genuinely busted for being a douchebag, you are required to disclose the person behind the wheel at the time, or take ownership of the citation for your vehicle.
Many thousands of tickets were also thrown out, and lawsuits won, because it was found that some of the yellow light times at intersections recently fitted with cameras were mysteriously set below the minimum time required by state law.
Mobile vans have been torched on occasion as well. Arizona is very anti-photo radar. Even the most nanny state type people admit that the cameras only cause traffic jams where they are installed and people just speed up after they pass the camera anyway.
That said they are fairly reasonable here, you have to be going 11+ over to even trigger them, and most are installed in places where people need to be paying attention anyway (eg coming from a isolated stretch of 60+ highway type road and starting to wind down into a denser part of town where there are lights and traffic, etc.) This in addition to the state law requiring bright yellow signs warning of photo radar almost a block away, it's hard to feel sorry for anyone who gets popped.
I've triggered a flash on several occasions making a legal left turn on a green arrow, having made a complete stop behind the line first and waiting for the arrow. I've never received anything in the mail, so clearly there is human oversight in the process of mailing citations.
I still won't be sad to see them go, just on principle.