Prior to any interrogation the investigator needs to do some preparation, these include being very familiar with all aspects of the case and preparing

• A. a personal diary
• B. a witness lineup
• C. a risk assessment
• D. an evidence case folder or a simulation of one

Answer: (D)

The main idea is to organize and study every facet of the case in a structured way before questioning. An evidence case folder, or a simulation of one, does exactly that by bringing all materials—reports, timelines, physical evidence, witness statements, notes—into a single, accessible package. This setup lets the investigator map out questions, plan the interview flow, and rehearse how to handle different responses. It helps identify gaps in the case, ensures consistency across interviews, and supports keeping statements grounded in the case file, which also aids admissibility and ethical interviewing.

A personal diary isn’t appropriate because it can introduce bias and isn’t a formal, comprehensive reference for the case. A witness lineup is a field tool used during investigation for identification, not a preparatory document for interrogation. A risk assessment is important for safety and process planning, but it doesn’t organize the case materials and interview strategy in the way a full case folder or its simulation does.

So, using an evidence case folder or a simulated version of one provides the best preparation for interrogation.