The emotional detachment displayed by Sgt. Friday, however, is generally not conducive to eliciting meaningful information from a subject.
People are more comfortable telling the truth to someone whom they trust and can relate to.
This is precisely why an investigator should spend the first several minutes of an interview developing a rapport with the subject. If proper rapport has been established, a subject should feel comfortable discussing the issue under investigation in a question and answer format. Questions addressing the issue under investigation should not be asked until the subject's behavior reflects this relationship. Some behavior symptoms that indicate rapport are an uncrossing of the arms, a forward lean or comfortable posture in the chair, longer, more detailed responses and head nodding in agreement with the investigator's statements. Identifying the purpose for the interview Upon first meeting a subject the investigator needs to identify the issue under investigation.