Crime: Databases

Home Department written question – answered on 8th November 2010.

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Photo of Philip Davies Philip Davies Conservative, Shipley

To ask the Secretary of State for the Home Department what recent estimate she has made of the number and proportion of unsolved crimes for which the investigation has been closed where there has been an unmatched DNA sample collected at the crime scene.

Photo of James Brokenshire James Brokenshire Parliamentary Under-Secretary (Home Office)

Information is not collected centrally from police forces on the number and proportion of unsolved crimes for which the investigation has been closed.

However, since April 2002 records have been captured on the national DNA database (NDNAD) match reporting management information database (MID) on matches between crime scene sample profiles and subject sample profiles.

As at 30 September 2010, there were 366,755 crime scene sample profiles on the NDNAD that had been submitted by police forces in England and Wales. As at 4 October 2010, an estimated 147,510 of these had not been matched to a subject sample profile. This represents 40% of the total number of crime scene profiles held on the NDNAD from police forces in England and Wales.

The figures provided are estimates as it is possible that some crime scene profiles were matched before 2002 and therefore not captured on the MID. The number of unmatched crime scene profiles may therefore be lower than indicated. It is also important to note that although a crime scene sample profile on the database has not matched to a subject sample profile, the crime may have been detected through other evidence.

The data provided are management information and have not been formally assessed for compliance with the Code of Practice for Official Statistics.

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