What are Class Characteristics?

What are Class Characteristics?

• A. Class characteristics are unique to a single source and cannot be used to eliminate sources
• B. Class characteristics are observed differences that identify a single item
• C. More than one source, can eliminate source... paint chips, fibers, glass, foot prints, tire impressions
• D. Class characteristics help determine the date of the crime

Answer: (C)

Class characteristics are properties of evidence that tie it to a group of sources rather than to one specific item. They come from common manufacturing processes or material traits, so many items share them. Because of that, they can help investigators rule out sources that don’t share the same features, narrowing the possibilities without pinpointing a single source. Paint chips, fibers, glass fragments, footprints, and tire impressions are typical examples—things that reflect general characteristics of a class of items rather than a unique item. In contrast, individual characteristics are unique to a single item and can link that exact item to the evidence. The idea of dating the crime scene isn’t determined by class characteristics, which is why that notion doesn’t fit.

Class characteristics are properties of evidence that tie it to a group of sources rather than to one specific item. They come from common manufacturing processes or material traits, so many items share them. Because of that, they can help investigators rule out sources that don’t share the same features, narrowing the possibilities without pinpointing a single source. Paint chips, fibers, glass fragments, footprints, and tire impressions are typical examples—things that reflect general characteristics of a class of items rather than a unique item. In contrast, individual characteristics are unique to a single item and can link that exact item to the evidence. The idea of dating the crime scene isn’t determined by class characteristics, which is why that notion doesn’t fit.