[holding answer 6 March 2008]: The police may, as part of their investigation of a crime, ask a participant in an intelligence-led screen, a victim, a witness, or some other person who has had legitimate access to a crime scene, to give a DNA sample voluntarily so that their DNA profile can be eliminated from those profiles found at the crime scene. Whether a person presenting themselves voluntarily at a police station is asked for a volunteer DNA sample will depend on the circumstances of the case.