What is the primary use of a crime lab report?

A crime lab report primarily serves to establish a suspect by detailing the scientific analysis of evidence collected from a crime scene. This report includes findings from various tests, such as DNA analysis, toxicology, ballistics, and other forensic examinations. The results are crucial in linking a suspect to a crime based on physical evidence, which can significantly impact the investigation and prosecution of a case.

While other choices may seem relevant in different contexts, they do not directly align with the primary focus of a crime lab report. For instance, providing legal advice typically falls under the purview of legal counsel rather than a scientific report. Enhancing community relationships is more about police-community engagement efforts rather than the function of a lab report. Serving as a witness is also not correct because the report itself is a documentation of evidence and findings; it does not provide testimony in court but can support witness statements by providing objective data.