A criminalist is a professional who specializes in the scientific analysis of physical evidence from crime scenes. They use various techniques to examine items like fingerprints, hair, and blood to help solve crimes. By applying their knowledge of forensic science, criminalists play a crucial role in gathering evidence that can be used in court to support investigations. These experts often work closely with law enforcement agencies, such as the police, and may collaborate with other forensic specialists, like forensic pathologists or toxicologists. Their work helps ensure that justice is served by providing accurate and reliable information about the evidence collected during criminal investigations.