Why is it important to interview a suspect separately from witnesses?

• A. To gather the exact same account from everyone.
• B. To save time by interviewing only one person.
• C. To avoid having to document statements.
• D. To prevent collusion or influence, capture each account independently, and reduce bias in statements.

Answer: (D)

Separating interviews focuses on preserving the independence of each account. When a suspect and witnesses are in the same room or interviewed one after another, people can influence each other—tendencies to agree with a authoritative or persuasive person, or to tailor what they say to match others. Conducting interviews separately ensures each person describes what they remember without those external cues, reducing bias and making it easier to spot genuine details and inconsistencies later. This approach also helps with credibility assessment, because you can compare how memories were formed across independent accounts rather than a single, potentially cross-contaminated version. Documentation is essential to keep an accurate record of what each person said, which you can review in light of other statements. The other options miss the point: getting identical accounts isn’t the goal, interviewing only one person to save time undermines thoroughness, and skipping documentation would undermine the integrity of the investigation.