What is the role of physical evidence in a criminal case?

The role of physical evidence in a criminal case is to help establish connections between the suspect, victim, and the crime scene. This evidence can include a wide range of materials, such as fingerprints, DNA, fibers, weapons, and items left at the scene. By analyzing this evidence, investigators can build a narrative that connects the pieces of the case, illustrating relationships and movements related to the crime.

For example, if a suspect's DNA is found at the crime scene, it creates a direct link between that person and the location or victim involved in the crime. Similarly, if a particular type of fiber found on a victim's clothing matches those found in a suspect's vehicle, it reinforces the connection between them. The ability of physical evidence to establish these links is a fundamental aspect of criminal investigation, contributing to the overall understanding of the incident and aiding in the quest for justice.

The other options either misrepresent the nature of physical evidence or suggest roles that are not aligned with best practices in forensic investigation.