I won't touch the debate on students' rights or cell phone policies, but it seems odd that teachers would be allowed to delete items. It puts them in a very precarious position, in a couple of ways.
Absolutely agreed.
Deletion of information should by my meaning be crime under any circumstances, all over the world. Blocking access is at least opened to discussion, even if I assume it is overused even in the current world and after all much less effective and unbreakable then expected in many lawyers should-work-like-this stories.
Anyways I (as multiple children parent) postulated a theorem what I would call "Psychological quantum law": You can either watch (either openly or secretly) someones information, or directly act according to (against) it. Period.
There are many examples in the wilderness (and I mean real children wilderness), that shows, that any other approach has just one of the following outcomes:
1) Any further information in such area gets hidden from you. Children are more clever than humans, didn't you know? And not knowing what your children REALLY do is dangerous weakness.
2) Your action will be forcefully (any means available from the nature of situation; no sorry or collateral damage considerations) immediately countered or long term undermined.
3) The child will hate you (even if in very moderate level, but the effects are cumulative over all the children life) because of strong injustice feeling; too bad should you be the teacher, fatal should you be parent.
There however ARE many good ways how to act regarding the information you know and here is the exception of the above mentioned "Children are more clever than humans" rule: in long term deep thought strategies you should always have top over children, stress on DEEP THOUGHT.
And there is one more psychological rule (this time even postulated by real psychologist), humans (including children) tends to act in the manner you assume they are when you interact with them. So the more responsibility you can pass to the children and the more you can make them to absorb, the best.
So as the conclusion I always tend to offer children more liberty than usual, however based on two pillars:
1) They prove in advance psychical and technical ability to cope with the situation under my supervision, eventually in prepared model situations.
2) They never betray the trust I put in them. Should they fail, the rights they poses are revoked appropriately. This is the best tool to deal with behavior like defiance, vandalism and even more subtle, like not willingness to help to old or incapable. Children like their freedom so much, that you can find just little more (if any) motivating things.
So far fully verified by my own results, however looking forward to check them in the stress testing of the puberty. Off course, application of this approach requires strong nerves and hypertrophic self- and in-children-confidence. And maybe plenty of undeserved luck as my wife use to say.