Q: can someone at my school or the police search my bag without a warrant
A: Because of the lower expectation of privacy that students have in schools, school officials need only have "reasonable suspicion" to conduct a search of a bag a student brings to school, not a warrant. This document summarizes the applicable laws (but it is several years out of date, there is more recent caselaw so you should consult with an attorney who knows about school searches): https://www.publiccounsel.net/ya/wp-content/uploads/sites/6/2014/08/school-search-and-seizure.pdf
A quick search on some recent relevant cases to show you the complexity of this:
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