Just don't start singing his praises too loudly in court and trying to act as his advocate. Here is a case I missed. It is called Oakfame Construction Ltd , and is important to all you expert witnesses and anyone who engages such folk. But before I get down to Oakfame , let me give you two important background details. First, if you give evidence in arbitration or litigation, the tribunal will shut you up if you start expressing an opinion.
Opinion evidence has a starting point of being inadmissible.
A witness is there to testify to the facts as he or she knows them. That is the formal position. However, by way of exception, the opinion of an expert may be admissible. The rules for expert opinion are important, which brings me to my second point. The courts have got fed up with terrorist experts and hired guns.