Please help me with this controversial prom issue!

Caution: long!
(Please forgive me for careless grammar errors. I’m not in the best mood)

My boyfriend was going to throw a spectacular prom after-party at a hotel. Now, I know they get broken up easily but he’s been planning this out for a very long time. I do not feel like explaining the details but basically this girl (let’s call her Jane) who was never invited nor uninvited to this party found out all the information and sent an anonymous letter to Brett (my boyfriend’s) house. Now, it’s a long story how we found out who it was. Brett went to her house as politely as possible asking if the mother knew the hand writing of the letter, but she said no. Hours later the women confessed and said Brett was agitated and demanding. I am a witness, he was not either of those. Jane called the cops after Brett left and said she felt “threatened” so the cops went to Brett’s and she actually got a restraining order on him. Brett does not know this girl, he can’t pronounce her name correctly (remember her name is not actually Jane) and has never seen her. The cops are interrogating Brett, suspending him and calling random people to the police station. Basically the entire school hates this girl now. She ruined senior prom for 60+ kids. I’m a junior so I don’t mind but this is where my question comes in – I’m going to the police station tomorrow because I had a facebook status saying “I absolutely despise my grade, except 99.9%”. Now tell me, how is that hateful? If they interrogate me what should I say, what shouldn’t I say?
What should Brett do? They’re sending black mail to his house and bulling him, yet the cops are protecting this girl?

**I’m asking fluther because all of you people are smart and witty. Please help. My boyfriends going to Stanford to pursue a career in anesthesiology. He needs to graduate. Help us.