Criminalistics is the scientific study of physical evidence in criminal cases. It involves analyzing various types of evidence, such as fingerprints, hair, fibers, and blood, to help solve crimes. By using techniques from fields like chemistry and biology, experts can identify suspects and link them to crime scenes. The work of criminalists is crucial in the justice system, as it provides objective data that can support or refute claims made during investigations. This evidence can be presented in court, helping to ensure that the right individuals are held accountable for their actions.