It's not quite that extreme, but the burden of proof is generally no more than preponderance of the evidence, i.e. more likely true than not true. This is the case for many associations that have internal discipline or jurisprudence for misconduct by their members.
By the way, the reason to retain a lawyer is so that you don't unwittingly say something that could create criminal liability. Nobody has a right to attend Tufts and as long as they follow their policies a lawyer or court is not going to stop them expelling you.