Legal Question in Education Law in California

You didn't mention whether or not your university is private, i.e., one of the numerous for-profit schools, or a public university in California. There's a big difference. I have handled a number of plagiarism cases, both as a university professor and attorney. It's clear that someone at your school has decided that you abetted in the other student's plagiarism. (Frankly, I'm surprised they every found out!) Your argument that you didn't intend to do this and were unaware that your friend would use your work. In a normal, court room situation, the university would have to prove their case and adhere to rules of evidence and procedure. Universities, especially in California, don't feel they need to. In my experience, university administrators are not only ignorante of due process but have contempt for it. That's what you're up against. Since this is an academic matter, the courts will defer to the university--unless there is an egregious violation of due process. Be sure to get as many written witness statements to support your position that you were just a good samaritan and didn't know your work would be appropriated. Also, use ever appeal in the university. Don't miss any deadlines. Demand a hearing, and keep notes on everything said and done.