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A crime scene investigator is a trained professional who gathers and analyzes physical evidence found at crime scenes. They are responsible for documenting the scene, collecting samples, taking photographs, and preserving evidence to be used in criminal investigations. Crime scene investigators work closely with law enforcement agencies to help piece together the details of a crime and identify suspects. They must have a strong attention to detail, knowledge of forensic science techniques, and the ability to work under pressure in order to effectively solve crimes.