Which of the following would NOT be categorized as physical evidence?

The correct choice for identifying what is NOT categorized as physical evidence is a confession made by a suspect. Physical evidence refers to tangible objects that can be collected and analyzed to support an investigation; it encompasses items like fingerprints, bullets, and hair strands that can provide forensic information. A confession, however, is a statement made by an individual, which does not consist of a physical item that can be physically examined or analyzed in a forensic context. Instead, confessions are treated as testimonial evidence, which relies on the reliability of the individual's admission rather than any material object. Thus, while confessions hold significant evidentiary weight in court, they do not fall under the category of physical evidence as defined in forensic science.