What does trace evidence refer to?

Trace evidence refers to materials that can be found in minute quantities, which have the potential to provide valuable information in an investigation. This can include hair, fibers, glass, soil, and other similar materials that may not be immediately visible to the naked eye but can link a suspect to a crime scene or victim. The minute levels make trace evidence particularly significant in forensic science, as it often requires careful collection and analysis using specialized techniques to reveal its evidentiary value.

The other options do not accurately represent trace evidence. Materials that are only visible to the naked eye do not encompass the essence of trace evidence, since trace evidence is defined by its small size and often imperceptibility. Evidence that is large in amount would typically fall under a different category, focusing on significant items rather than small fragments. Finally, evidence left by witnesses refers to testimonials or statements made by individuals, not physical materials that could serve as trace evidence. This clarifies the distinct nature and importance of trace evidence in the context of forensic investigations.