Principles of Investigation

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1. The success of an interview or interrogation depends on a number of personal characteristics and commitments of the investigator. Planning for and controlling the events surrounding both interviews and interrogations are important but are generally viewed as more critical to the success of an interrogation. The success of the interviewer or interrogator and of the interview or interrogation is often determined by the time and dedication committed to preparing for the conversation. The interviewer must become familiar with the facts of the case under investigation and with the victim. The interrogator must learn as much as possible about the offense, the victim(s) and the suspect through the process of collecting, assessing, and…show more content…
When obtaining valuable facts the interrogator should make every effort to obtain accurate information from the source. He or she needs to assess the source correctly by repeating questions at varying intervals. The interrogator, however, is not the final analyst and should not reject or degrade information because it conflicts with previously obtained information. The interrogator's primary mission is the collection of information, not evaluation. Conversely, the interrogator should not accept all information as the truth; he views all information obtained with a degree of doubt. If possible, and when time permits, he should attempt to confirm information received and annotate less credible or unproven information. It is of great importance to report accurate information. The interrogator should also check his or her notes against the finished report to ensure that the report contains and identifies the information as heard, seen, or assumed by the source. One of the key functions of factual analysis during an investigation is to establish an initial expectancy of a suspect's guilt or innocence, which tends to increase the confidence and accuracy in rendering an opinion of the suspect's probable involvement in a crime, once that suspect is interviewed. For example, if a suspect was determined through factual analysis to be probably innocent of an offense, and also exhibited typical truthful behavior during an interview, then the investigator has two sources of

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