Whatever happens with the employee is irrelevant. The grade has been assigned and is now on 200 students' transcripts. I'm not giving "the arbitrary right" to anyone. The principal has earned the right, by virtue of his or her position, to make changes as appropriate. I completely believe that there should be some sort of documentation, appeals process, or whatever. I'm not advocating that the principal should be able to go into everyone's gradebooks and change every grade for no reason. The principal is in charge of the school and what happens in it. He or she is the one responsible for those decisions. As a teacher, I assign the grade, make copies of my gradebook, and CYA (CMA?). Then I leave it at that. I trust my principal to make the right decision. If you don't trust yours, then YOUR principal needs to be replaced.