In 30+ years of law enforcement, Mr. Anderson learned an unfortunate fact: Many police officers don't take very good witness statements. In fact some of them are just plain terrible. Its not their fault... they were most likely, never trained what to ask and how to draw out the information from a witness. Mr. Anderson has had that training and has the experience to locate and properly interview witnesses in your case.
Mr. Anderson knows what questions to ask and how to evaluate whether a witness is credible and determine what value that witness would have if called upon to testify in court or other legal proceeding. If you are an attorney wouldn't you like to know ahead of time if a potential witness will help or hurt your case? Mr. Anderson also has experience as a trial monitor for jury cases.