An expert witness is a professional who by virtue of training or experience has some expertise and is specialized in a subject in a particular area and they can be relied upon to give their opinion about given evidence. Their opinion can be accepted or not depending on their level of argument in convincing the court. It clearly is important to review your options when you have been told to hire one in your case. The list below tries to outline some of the crucial factors to consider before hiring a forensic accounting expert witness California.