What happens if the judge by some chance witnesses the crime? Has this ever happened?
Or is the judge always picked in such a way that they could never be a witness? (Out of fears of bias or whatever)
I was thinking about ancient or medieval situations where the ruler would witness a crime and order a punishment directly, since he didn't need more convincing, and they were judges for all intents and purposes once upon a time. I guess they can't do that today anymore, but what would happen if a judge today would witness the crime directly and just happen to be deciding in the court case?
Let's say for example the judges in some location happen to be visiting a security facility for some guided tour or whatever, and they get to see the security cameras just as somebody is burglarizing the monitored building, so you can only get "non-witness judges" from out-of-state or another region. The lawsuit hasn't begun yet, and all of the possible, local judges saw it happen.
How does it affect the process? Is the defendant automatically prevented from pleading not guilty? Is evidence still necessary, is the process just a formality then? What effects would it have on the process and verdict themselves?