What are the reasons for gaining information about the interviewee?
Make it easier for the interrogator to establish rapport and anticipate the subjects scope of knowledge
Anticipate possible subject reactions to questions and points of potential resistance
May provide the interrogator with insight into the possible motives of the crime and rationalization/themes
Helps identify the type of accusation that might be productive
May also preict the subjects behaviour during past interviews or interrogations
Helps to identify possible involvement in other crimes