It's something you should share with your children (grown or not). I have a particular interest in this subject because of "zero tolerance" policies in schools. Too often, children defer to authority -- as they've been taught by ...uh... the authorities -- and when the principal says "Write out what happened and sign it," that resulting confession is often given to the police. Cops certainly can't demand that a suspect write a confession without first advising the suspect of their rights ("You have the right to remain silent..."), but school officials -- typically government agents in their own right -- don't seem to have a problem obtaining confessions for use against their own students, even without bringing in their parents first (let alone a lawyer). Kids (and adults!) often don't understand that they are sealing their own fate when they comply with such outrageous demands.
The kids don't have a choice in this situation, do they? From what I remember, the Supreme Court has ruled that students in public schools don't have constitutional rights. If the school wants to expel the student for not talking, they can do so.