What is the primary responsibility of a crime scene investigator (CSI)?

The primary responsibility of a crime scene investigator (CSI) is to collect, preserve, and analyze physical evidence from a crime scene. This role is crucial in the criminal investigation process, as the physical evidence—such as fingerprints, blood samples, and other materials—serves as the foundation for establishing facts about the crime, identifying suspects, and supporting or refuting accounts presented in the investigation.

A CSI employs specific methods and techniques to ensure that evidence is collected in a manner that maintains its integrity and chain of custody, which is essential for potential use in court. The analysis performed on this evidence can link suspects to the crime, corroborate witness statements or alibis, and play a pivotal role in securing convictions or exonerations based on scientific findings.

Other tasks, such as documenting witness statements, conducting interviews with suspects, or providing legal representation in court, are typically performed by other professionals, such as detectives, attorneys, or legal advocates. While these activities are important in the overall investigative and judicial process, they fall outside the primary responsibilities of a crime scene investigator.