At the beginning of the grading period (6 weeks) the students receive a bathroom pass from me. The strip of paper is stapled into their agendas. My name is on the pass and the numbers 1, 2, and 3. When they need to use the bathroom, I cross through one of the passes. I initial and date the pass. If they run out of their 3 passes before the 6 weeks are up, they receive a responsibility infraction. In our school, receiving 5 responsibility infractions equals a detention after school. This seems to work well and has cut down on bathroom breaks.