Interviewing the Witness, a crime scene investigation.

A. Preinterview Preparations and Decisions
Principle: Preparing for an interview maximizes the effectiveness of witness participation and interviewer efficiency.
Policy: The investigator should review all available witness and case information and arrange an efficient and effective interview.

Telling witnesses facts about the suspect or case may influence their memories of the incident. The interviewer must ensure that information from the witness is based only on the witness's memory and not on any information gleaned from the interviewer.

The difference between interview and interrogation is that an interview is conducted in a cordial atmosphere where a witness is more comfortable physically and psychologically.