Toolmark analysis is primarily used to evaluate what?

• A. DNA sequences in bloodstains.
• B. Electronic device metadata.
• C. Photographic scales in crime scene photos.
• D. Marks left by tools on surfaces.

Answer: (D)

Toolmark analysis focuses on the impressions and striations a tool leaves on a surface. The idea is that the tiny, unique features of a tool—its edge geometry, wear, and manufacturing imperfections—transfer to whatever the tool touches, creating a pattern that can be compared to marks made by a suspect tool. By examining these marks at high magnification and often producing casts or 3D profiles, investigators assess how similar two marks are and whether a particular tool could have produced a given impression. This work is specific to how tools interact with surfaces, unlike DNA analysis, digital device data, or the use of scales in photos, which belong to other areas of forensics.