Which of the following is a common form of physical evidence used in investigations?

Hair, fibers, or glass fragments are considered a common form of physical evidence in investigations due to their ability to link a suspect to a crime scene or victim. This type of evidence is tangible and can provide crucial information about the circumstances surrounding a crime. For instance, hair and fibers can be transferred from a person to an object or vice versa, and forensic analysis can often identify characteristics that help connect these items to individuals.

Additionally, fragments of glass can indicate a violent encounter (such as breaking a window) or the presence of a suspect at a particular location. This physical evidence can be collected and analyzed in a laboratory, allowing experts to draw conclusions based on their findings, such as matching fibers or hair to a specific individual or linking glass to a specific source.

While other options like witness statements and surveillance footage are important components of an investigation, they do not encompass the physical nature of evidence as closely as hair, fibers, or glass fragments do. Witness statements are subjective and can vary based on perception, while surveillance footage relies on external technology. In contrast, physical evidence is less prone to interpretation issues and can often be definitively analyzed.