It doesn’t take much for an employee who has been terminated to take a discrimination claim to court. For example, all a woman has to allege is that she is a member of a protected class (female), was qualified for her job, was discharged and was replaced by someone who is not a member of her protected class—that is, that a man replaced her. It’s then up to the employer to prove it had a legitimate, unrelated reason for the termination. It can’t rely strictly on her status as at-will.