How should tool marks be handled after being photographed?

The correct action after photographing tool marks is to obtain and impound the item that bears the marks. This step is crucial because it preserves the physical context of the evidence. Tool marks can provide valuable information about the tool used and its characteristics, which may be critical for an investigation.

By impounding the item, investigators ensure that the evidence remains intact and uncontaminated for future examination. This allows forensic experts to analyze the relationship between the tool and the mark it left, potentially linking a suspect to the crime.

While other options may seem practical, they do not adequately preserve the integrity of the evidence or facilitate further investigation. For instance, simply leaving the marks as they are does not protect them from environmental factors or accidental damage. Covering them with protective plastic could compromise the marks, as plastics can sometimes react with residues. Marking them with paint would alter the scene and the physical evidence, making it less reliable for analysis. Properly impounding the original item ensures that all details, including surrounding evidence, are preserved for a thorough investigation.