Crime Scene Investigators (CSIs) are professionals who collect and analyze evidence from crime scenes. They work closely with law enforcement to document the scene, gather physical evidence, and take photographs. Their goal is to preserve the integrity of the evidence for future analysis and potential court cases. CSIs use various techniques and tools to examine evidence, such as fingerprints, DNA, and ballistics. They often collaborate with forensic scientists and other specialists to interpret the findings. Their work is crucial in helping to solve crimes and ensure that justice is served.