so your saying out of an entire population we select a sample of students in extracurriculars for simple random selection. only problem is, does that sample truly reflect the whole of the population.
I would be more concerned about the students NOT in extracurriculars than the students in extracurriculars. Those are the ones that typically fall through and turn to drugs.
Even in large schools such as Russellville High School in AR where the graduating class has 500 students and there is a club for everything including Football, Basketball, Track, Cross Country, Soccer, Tennis, Band, Choir, Orchestra, Baseball, Volleyball, Cheer, Drill Team, Golf, Gymnastics, Swim Team, Wrestling, Yearbook Staff, Horticulture Club, Computer Club, Beta Club, JROTC, Art Club, Spanish Club, French Club, Drama/Thespians Club, High School Rodeo Team, etc. The list goes on for pages.
Even in a school that large with a wide range of activities, its fair to say that the majority of students are not involved in extracurricular activities, especially now in tough economic times when parents simply cannot afford to pay the fees.
If a school imposes drug testing it, should be for ALL students. It's the best step towards ensuring the campus remains drug free if all students know and understand that they may be searched for drugs and drug paraphernalia and will face expulsion, a trip to a juvenile detention facility where they will have a judge decide their fate. And the student will not be allowed to return to the district until their sentence has been completely served and the judge writes a letter stating the student is fit to return to the school to be reintroduced to the student body as a meaningful contributor.