New Jersey v. T.L.O., 469 U.S. 325 (1985), is a case in which the Supreme Court of the United States established the standard of reasonableness for searches of students conducted by public school officials in a school environment. The Court held that the Fourth Amendment to the U.S. Constitution, specifically its prohibition on unreasonable searches and seizures, applies to searches conducted by school officials. However, school officials do not need to have probable cause or obtain a warrant before searching a student. Instead, in order for a search to be justified, school officials must have reasonable suspicion that the student has violated either the law or school rules.