This is a great topic and a very big problem. Some of the solutions mentioned above are very good ones but almost impossibe for the little tourn. in high school gyms. I am sure everything has been tried at least once, but here is my idea. Post huge signs at the entrance of the tournament, around matside, in the weigh in room saying "Anyone around the mat when not warming up or wrestling will be given a mark of some kind. After receiving two marks you will be asked to leave and not finish the tourn." I know this seems very strict and hopefully the bathrooms won't be overloaded from individuals trying to scrub the mark off, but at least they will be off matside. Something needs to be done about this serious problem. Try it. Coach Rees