This brings me to interviewer bias and suggestive interviewing techniques. In my experience, sometimes it's truly difficult to avoid these problems. Police arrive on the scene of a call and we immediately form an opinion on what occurred. We then subconsciously seek information to verify our initial beliefs. It takes a lot of discipline and experience to keep an open mind and to consider an alternate hypothesis from the apparent obvious.
After reading this section within the book about child interviews, it reaffirms the importance of utilizing open ended questions. I know in modern times, only detectives who go through extensive training and courses are qualified to conduct interviews on children to avoid obtaining false information.