Ugh - I have thought of this and wouldn't do it! I don't even want to think of the latches or doorknobs either. Have you heard of better solutions?Leslie - Teach Junkie.com
My neighbor teacher across the hall has the student numbers written on the left side of her metal door frame. When someone leaves, s/he takes a magnet from the right side of the door frame and puts it on the student number. Different magnets are for different purposes, e.g. BR, office, library, etc. She knows at a quick glance who's out.