Specifically, when a student was accuse y a teacher of having been smoking in the bathroom and the student denied it, her belongings were searched by the principal. This search revealed cigarettes and marijuana, but the search itself was challenged, and this challenge made it all the way to the Supreme Court. There, the justices decided that students had a reduced expectations of privacy at public schools, and that therefore the search had not violated the student's Fourth Amendment freedom from unreasonable searches. This has led to many search initiatives primarily geared towards eradicating drug, alcohol, and tobacco use in schools but has also been applied in searches for weapons and other potentially dangerous or harmful material on school grounds. The War on Drugs, at least in the schools, got another...

Earls (2002), which determined that it was fully legal for schools to test all participants in extracurricular activities for drug use. Though this was also seen as a violation of Fourth Amendment rights by some students and parents, as well as others less directly involved in the issue, the Supreme Court ruled that the school had a pressing interest in the matter and that, since participation in the activities was voluntary, this interest outweighed privacy concerns. In this way, school license to eradicate drug use was again enlarged.
References

Justia. (2010). www.justia.com. Accessed 4 September 2010.

Oyez. (2010). www.oyez.org. Accessed 4 September 2010.