Information on the number of crimes detected in 2007-08 in which DNA was available, or played a part, and in which the offender had a prior conviction recorded on the Police National Computer (PNC), is not available from the National DNA Database (NDNAD) or from police force data collected by the Home Office on forensic activity and related detections. The NDNAD holds DNA profiles taken from persons arrested for a recordable offence but does not hold data on their criminal histories; this information is held on the PNC.