Detective how-to

How to Conduct a Witness Interview

Good interviews gather accurate information.

Updated By the Career Education Institute Curriculum Team
Quick answer

Good interviews gather accurate information. In short: interview; build; ask, then complete the remaining steps below.

Step by step

  1. Interview witnesses separately.

  2. Build rapport and explain the purpose.

  3. Ask open-ended questions first.

  4. Let the witness tell the story without interruption.

  5. Ask follow-up questions for details.

  6. Document the statement accurately.

Safety reminders for detectives

  • Plan for officer safety during contacts
  • Follow evidence safety for biohazards and drugs
  • Use peer support for traumatic cases
  • Follow legal procedures to protect cases

Chain of custody · Probable cause · Search warrant · Miranda warning · Lead · Canvass: see the full detective glossary.

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