Which statement describes the purpose of class characteristics in tool mark analysis?

• A. To pinpoint exact tool used
• B. To categorize marks into groups based on manufacturing attributes
• C. To measure wear
• D. To detect color of metal

Answer: (B)

Class characteristics in tool mark analysis refer to features that are shared by tools produced by the same manufacturing process or type, which lets investigators group marks based on those attributes. The main purpose is to narrow the field by showing that a mark could come from tools within a particular class—things like general shape, edge geometry, or pattern typical of a tool type or manufacturing lot. This categorization helps exclude tools that don’t share those manufacturing features and focuses the comparison on tools that could plausibly have created the mark. Only after this grouping do examiners look at individual characteristics—unique wear, nicks, or micro-striations—that might link a specific tool to a specific mark. The attempt to identify an exact instrument from class characteristics alone isn’t reliable because many tools share the same manufacturing attributes, whereas individual characteristics provide the distinguishing detail.