madseel one question, how come the teacher cant go and see the techie?

now for something completely diffrent,
being one of these people on occasion i would suggest that you turn there own technology against them use there keyloggers to see what they are doing, also if these people are males as i suspect, it probably wouldn't occur to them to put on a physical device so don't worrie about that. and i would take this to the school principal imediatley.