A Researcher would use the information of a former criminal in their studies to see how much a person would tell a researcher compared to what has been actually proven. When people chose to speak up and tell something they are biased towards themselves so they might change up the truth to make their reasoning sound better. That’s good for researchers because it kind of gets them into the mind of a criminal. Then comparing the what they were told to documented evidence it will give a interesting perspective in their studies.