There's also the aspect of a student being falsely accused of cheating. I was unfortunate enough to have experienced this during my college career. A fellow student, whom I didn't know outside of class, copied my answers exactly on a German exam. I don't know why he did this, because there were only 15 students in the class and the professor knew us all fairly well. To think the professor wasn't going to notice was a stupid assumption on his part.
I was called in to her office and shown the two tests. The answers were the same down to the punctuation even. It was clear the other guy was very bad at cheating and probably did it out of desperation. I was initially shocked and feared I was going to fail the class despite my innocence. She had to refer the incident to the honor board due to university policy. When I left her office I was so furious that I looked up where the other student lived because I wanted to fight him. But I took a walk, cooled off and decided against it.
I was ultimately cleared by the board and there were no marks on my record. After the proceedings were over, the professor apologized to me and said that she never believed for a moment that I had cheated, or that I had helped him cheat. She pleaded with dean to avoid sending the matter to the honor board, but she had to follow policy.
She said she never had any cheating incidents in the past, and that it was personally distressing for her to handle the situation. It was definitely stressful for me as well.