content: Courtrooms are somewhat like theaters where the jury is the audience.  Whether it's logically required or not, pulling out an "expert witness" is psychologically persuasive, whether their testimony is necessary or not. The bottom line is that Hillary seemed convinced the guy was guilty and used whatever tricks she could, to get him off.  That's the way our system works - each side tries to twist the truth to achieve the desired outcome.  What is important in this case is that she did it "as a favor" it's not as if she were a court appointed lawyer in this case.  She completely and of her own free will decided to manipulate the system to let a pedophile rapist go free.