Trying to find a way to solve the problem of students missing out on class instruction by going to the bathroom too frequently? Well, here's an answer. Give each student a designated amount of bathroom passes per grading period (i.e. two per six weeks), and inspire responsibility in them by having them learn to use them only when necessary and by keeping track of their passes.
Type in your name and room number and all you have to write in is the student's name when you distribute them.