My school has recently implemented a program of issuing pencils and paper to all students from 7th grade through high school seniors. As you can imagine, it's a serious nightmare. Apart from the usual run of broken pencils, we have a major problem with students writing notes to each other during class. Is there any effective way to allow the teacher to monitor what students are writing from his/her desk at the front of the class? Some of our teachers have come up with creative solutions like hanging video cameras above each student's desk, but a method which could be performed on the paper itself would be even better.