Issues
Searches & privacy
Limits on official searches appear in many constitutions. Who may search, what suspicion they need, and whether a phone is different from a locker are local questions.
United States public-school map: the Fourth Amendment binds government actors. T.L.O. (1985) applied it to public-school searches but allowed a reasonable-suspicion standard rather than a warrant in many school searches. Redding (2009) held a strip search of a 13-year-old unreasonable on those facts. Vernonia and Earls upheld some suspicionless drug-testing programs for athletes and some extracurriculars. Riley v. California (2014) is a police-and-phone case after an adult arrest; it is not by itself a student-handbook rule.
YCP will not publish a one-line “never unlock a phone” or “always unlock a phone” rule for any country. If a search is happening now, this site cannot represent you. Ask a trusted adult. Afterward, write a timeline.