I got one during Phoenix Forum in 2002 or so. I ran a light.
This was when the camera ticket system was rather new, and they weren't hooked up to government databases. Back then if you got a ticket they sent you a notice, expecting you to pay - but if you didn't pay nothing happens. I never paid the ticket.
Here's the photo they took:
I think these are horrible. It's a lame way to enforce the law.