What is one of the main purposes of physical evidence at a crime scene?

One of the main purposes of physical evidence at a crime scene is to identify the suspect or victim. Physical evidence, such as fingerprints, DNA, and trace materials, plays a crucial role in linking individuals to a crime. For instance, biological evidence like blood or hair can be directly analyzed for DNA, which can conclusively identify a perpetrator or victim. Additionally, objects found at the scene can provide important information about who was present or involved during the incident, further aiding in identifying suspects or victims. This identification process is vital for law enforcement as it helps build a case, establish connections, and lead to more accurate investigations.