Is it illegal for a principal to read a student's text messages without any party giving consent?

I don't think it is allowed unless there is reason to believe there is content on the phone that is considered illegal or not tolerated at school.

But they legally aren't allowed to do so at all unless they contact the parent first or let the child know they're going to do it.

first of all, you do not have a leg to stand on; You pronounced scholars on your college could have their telephones confiscated via team, so your interior the incorrect for having your telephone interior the 1st place. Secondly, except your telephone is on your backpack or locker, then there is not any clever expectation of privateness, when you consider that faculties, hallways and lecture rooms are public. ultimately, when you consider which you're vioalting college coverage and you realize it why do no longer you have the experience to a minimum of lock your telephone, so team won't be able to get right of entry to your messages. I think of the college will argue those self same factors, no longer too point out that they are analyzing them interior the pastime of public secure practices (scuffling with fights or different extra serious crimes). the two way you're no longer likely to wind up dropping

The courts have ruled repeatedly that rights granted under the constitution do not apply to schools.

the may:

Ban clothing they determine to be offensive in breach of freedom of expression laws.

Search a student or locker without a warrant in breach of privacy laws

May suspend a student for posting derogatory statements about others on a website, even if done outside of school

Sorry, but he has the right.

most probably yes, a police officier cannot read your text messages without either consent or some sort of warrant.

it is not allowed. unlawful search... this is a minor being depraved of privacy without parental consent. PTA and school board would love to hear about this...

Yes, any evidence will not be admissible assuming there was no good reason to look.