What type of statement should be obtained from witnesses when necessary?

Obtaining written statements from witnesses is crucial in criminal investigations for several reasons. Written statements provide a clear, documented account of a witness's observations and recollections, which can be critical during legal proceedings. These statements serve as a reliable record that can be referred back to later for consistency and accuracy. Furthermore, written accounts are less prone to misinterpretation than verbal accounts, which can be influenced by emotions or the witness's memory at the time of questioning.

In legal contexts, written statements can also be authenticated and entered into evidence, whereas informal conversations, verbal statements, or unrecorded video evidence might lack the same weight in court. Written statements may be further corroborated by other evidence, thus reinforcing their validity during investigations and trials. This method also helps in preserving the integrity of the witness's account before any external influences can alter their testimony.