Drug Testing...Testing Students Rights

In the Court cased of Acton and Earls, students felt that drug testing was and invasion of privacy and they said their 4th Amendment rights were being taken away. The Court stated in the Acton trial, "Taking into account all the factors we have considered above--the decreased expectation of privacy, the relative unobtrusiveness of the search, and the severity of the need met by the search--we conclude Veronia's Policy is reasonable and hence constitutional...." The Court in the Earls case stated, "Finally, we find that testing students who participate in extracurricular activities is a reasonably effective means of addressing the School District's legitimate concerns in preventing, deterring, and detecting drug use."
These cases say that students really don’t have a right to privacy. I mean students have some right, just not 100% of a right to privacy.
 I agree with the Court (yeah I know I'll get crap for saying it) only because I know firsthand what drugs do. I have 3 cousins who all do drugs and it's been hard on our family. Then I hear how kids in my school are doing drugs and it just angers me. I want them to know that it's bad and you can die from it, but I know they are going to do what they want anyway. If the students do take drugs they shouldn’t be able to participate in sports and clubs because they won’t be in a state of mind to do them. It’s not the schools problem, but if students are taking drugs than playing sports or doing activities it reflects poorly on the school. Drug testing should be aloud in schools 100%, it will help students more if they know that they are getting drug tested.