I'm all for testing. Most schools are testing all students involved in extra-curricular activities. Some schools are even considering activities such as dances, clubs and proms as extracurricular, and if you don't sign the drug test paperwork with your enrollment form, you are not able to participate in any of those activities all school year. Also, to be legal, I believe that it has to be totally random. A specific student could theoretically be tested several times, while many never get tested.