Add Comment Question: does the employer have to prove termination for just cause at arbitration Answer: Since you are talking about arbitration, I'm assuming you are unionized. Therefore, you should speak with your union about why you were let go and what the employer would have to do to prove it's case. Your Comment * Your Email * Your Name * Your City Note, your name, city and email is not displayed on the website. It is used to notify you that we have approved your comment.