Which method of sketching documents evidence found on walls by allowing walls to be folded out?

The correct response, which involves sketching documents of evidence found on walls by allowing walls to be folded out, is the exploded view or cross-projection. This technique allows for a three-dimensional representation of evidence that is normally two-dimensional when viewed from a single perspective. By 'exploding' elements outward, the investigator can depict how various pieces of evidence relate to one another in space, which is particularly useful for capturing the context and spatial relationships when evidence is situated on vertical surfaces like walls.

This method is particularly beneficial in scenes where multiple items of interest are located close to one another or when the evidence is layered, as it helps to avoid cluttering the visual representation. The exploded view effectively communicates the arrangement and individual significance of each element, which is crucial for investigations and later presentations in court.

Other methods, such as floor-plan view or bird's eye view, typically provide top-down perspectives that may not convey the necessary depth or relationships between wall evidence and the surrounding environment. Vertical projection focuses on representing the layout directly above vertical features, which may also lack the depth of information that an exploded view provides. Thus, the exploded view serves as a vital tool in accurately documenting and analyzing evidence in a three-dimensional context.