Forensic Pathology is a subspecialty of pathology used to investigate crime scenes and the corpses of people who have died suddenly or violently. It incorporates anatomical pathology, histology, DNA technology, firearms examination, trace evidence, serology, and toxicology. It uses a range of techniques to undertake autopsies, also known as post-mortem examinations, and conduct forensic analysis, to help determine the cause of death and how the person died. Investigation involves collection of DNA, blood and tissue samples, laboratory testing, stage of death analysis, and also studies the medical history of the deceased, witness statements and any other documentation from the scene. Forensic Pathology assists law enforcement agencies and families and makes contributions to public health and preventative medicine by studying the dead.