I'm not sure about that Oneironaut, one time when i was at school, someone gave them an anonymous tip that i had weed in my car, and they still had to call my dad to get permission from him to search my car.

Captain Hanks- call a lawyer and ask!!!

But if it was legal, then at that meeting you need to do some MAJOR ass kissing. Dress up very nicely, and when you go in there be extremely polite, and just tell them you are extremely sorry and it will not ever happen again and you would like another chance to prove you can change.