I took an exam in my university in a class that has 7 students. It was an open note and book, because of that we were given permission by the teacher to move seats in order to have more space to use our book and notebook. During the exam I was sitting on the lab benches. The next day the teacher sent me an email telling me that I was cheating with a that sat 10 sits away from me, because we answered one of the question wrong and we explained it the same way. The whole class is willing to testify that me and the boy were nowhere near each other, so there's no chance of us cheating unless we were having phone conversations which would be pretty obvious to her during the exam. Now my question is can a teacher just accuse students of cheating even if they didnt see it happening?