Which of the following is NOT typically considered a trace evidence?

Trace evidence refers to small, often microscopic materials that can be transferred from one location to another during the commission of a crime. These materials can help establish a connection between a suspect, victim, and a crime scene. Common examples of trace evidence include pollen, human hair, and dust and soil, all of which can be easily transferred and can provide insights into a person's movements or associations.

A firearm, on the other hand, is classified as a distinct type of physical evidence rather than trace evidence. Firearms are typically larger objects that do not fit the definition of trace evidence, which focuses on smaller, more minute items that may not be visible without proper forensic techniques. Therefore, recognizing that a firearm does not belong in the category of trace evidence highlights the important distinction between the types of evidence encountered in criminal investigations.