I once got caught by a red light camera. I had the company running it subpoenaed. Asked them to provide me with the source code for the camera. I told them that it was my right to face my accuser and since the only witness was the computer operating the camera, I wanted to cross examine it.
The company dropped the case like a hot rock.
Sounds like a god idea.However,that wouldn't really work in my state (Massachusetts). Not long ago the state Supreme Court ruled that when one is challenging a ticket...speeding,red light,etc...in court the person challenging can be assessed various court fees *even if the challenge is successful*.
So in this state if a cop issues you a ticket it's gonna cost you even if he/she was wrong to issue it.