Murder victim. Exposed hand of a murder victim who has been buried in a shallow grave. The murderer is walking away from the crime scene. Forensic science may be able to help convict the murderer through evidence linking the criminal to the crime scene. This may include blood under the victim's fingernails, deposited during a struggle with the murderer. Hair, other organic material and clothing fibres can cross- contaminate the body and the murderer's clothes. Even earth from the ground may adhere to the murderer's shoes and help to place the murderer at the crime scene.