As a 2006 graduate of Northwest High School, I can remember clearly where the administration publicly concentrated its efforts. If they put as much energy into solving this problem as they did dictating who was allowed to wear what and who was absent from the school each day then they would have already solved this problem. I remember there being a total of six restrooms that had regular accessibility by the students; one in the gym, one in the cafeteria, and four in the main halls of the school, along with an additional faculty bathroom, totaling seven restrooms.

One way to curb this problem is to seal off all bathrooms except two (there are two that are situated around the cafeteria which is at the practical center of the school), allow access to these bathrooms only during class (there would be too high of volume between classes to accurately check for anyone writing on the halls and be sure who it was) and have these monitors check the stalls after each use. Somebody made a pretty accurate description of who it probably was in an earlier post; a white 9th grader full of teenage angst who hates the world and has some "Oh woe is me" attitude.