Eh...I am going to kind of disagree with the "asked, but not forced bit". What minor has any clue that they can disagree with what is happening?
Given that the police can do a LOT to a minor without needing parental consent, don't you think THEY would know where the lines are? Don't forget there was an officer present.
However, because it was a school I am not certain whether or not the school's actions were improper. I am guessing however that at least 9.9 times out of ten the school knows what they can or cannot do and does not deviate from that.
Since the OP is apparently a minor its up to his/her parents/guardians to challenge what took place if they believe that the school's actions were improper.
I do know of a couple of situations where school administration messed up...but again, its up to the OP's parents/guardians to make that challenge if they are inclined to do so.
I see it going absolutely nowhere
legally (in terms of addressing any alleged wrongdoing).
I also, however, see the school having to roll its eyes and overturn their initial punishment for no other reason that idiot parents have a tendency to call the press and transform their little darlings into Angels being abused by the Big Old Mean School which is, in my opinion, quite tragic. It's called Bradyism in some circles.
But that seems to be the state of things today. Le sigh.