Interstingly enough, I learned that a practice that one of college professors used to employ while returning exams was highly likely to be a violation of FERPA. The professor would begin the returning of exams by posting the grade ranges on the board along with the number of students that fell into each range. The professor would then hand out the exams in the order of the ranges. For example, say there were 10 students that received a 90-100 and 15 that received a 80-89, the professor would hand out the grades in this order starting with highest score. In this case, every student had a reasonably good idea of what each fellow student scored.