Which statement best describes the retention durations for sustained formal vs sustained informal investigations?

• A. Sustained formal investigations are retained for 30 years
• B. Sustained informal investigations are retained for 3 years
• C. Sustained formal investigations are retained for 3 years
• D. Sustained informal investigations are retained for 30 years

Answer: (D)

Retention durations differentiate how long records stay on file based on how formal the investigation is. Informal sustained investigations are kept much longer to preserve historical context and support long-term oversight, training, and trend analysis. Thirty years gives the department a lasting record that can be referenced for patterns or future inquiries. Formal investigations, on the other hand, are retained for a shorter period—three years—since they involve formal actions and may be superseded by newer policies or newer cases. This combination—long retention for informal cases and shorter retention for formal ones—best matches how the agency maintains records over time. The other options mix up these durations, assigning the long period to formal investigations or the short period to informal ones.