Have you ever had a student insist they handed in one or more assignments when you know they didn't? How about the irate parent who insists you are singling out their child or bullying their child because you claim the assignments weren't handed in, but their child says he handed them in? What do you do?
It's a dilemma and puts you in the hot seat when the student should be the one in the hot seat. Turn the tables and make the student accountable by using a Pink Sheet.