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It should be noted that non-sanction detections that contribute to the percentage change in detection rates have fallen in recent years reflecting a significant shift by many police forces away from recording detections
of crime where no further action is taken. For this reason overall detection rates over time are not fully comparable.
From 2 April 2007 the rules governing recording of non-sanction detections were revised to reduce the scope within which they can be claimed to a very limited set of circumstance. In terms of offences detected by the police, the preferred measure is now to use sanction detections.
|Detection rates for offences recorded and detected in North Yorkshire|
Offences detected in a given year may have been initially recorded in an earlier year and for this reason some percentages may exceed 100.
Chris Huhne: To ask the Secretary of State for the Home Department how many and what proportion of (a) white, (b) black and (c) Asian (i) men and (b) women aged (A) 10 to 15, (B) 16 to 17 and (C) 18 or more years old were on the national DNA database in each year since 2001. 
Alan Johnson: The national DNA database (NDNAD) is constantly changing as profiles are added and deleted. It is not possible to produce information retrospectively on the state of the database in past years, unless this was collected by statistics produced at the time. The information sought on the number of those on the NDNAD by the ethnicity, gender and age groups specified is available for 31 March 2009 and 31 March 2008 and is provided in table 1. Some information is also available for 31 March 2007, and is provided in table 2. The information sought is not available for years before 2007.
The tables show the number of profiles held, which is not the same as the number of individuals. This is because some profiles are replicates i.e. more than one profile is held for one individual. This may occur if, for example, an individual gives different names, or different versions of their name, on separate arrests. As at 31 March 2009, the replication rate on the NDNAD as a whole was 13.5 per cent. The tables show data on profiles loaded by all police forces.
It is not possible to calculate accurately the proportion of members of ethnic groups in the population as a whole who are on the NDNAD because the data held on the NDNAD are not directly comparable with census population data. The NDNAD does not hold self-reported ethnicity data on arrested persons who have a DNA sample taken, but on their 'ethnic appearance'. The ethnic appearance data is based on the judgment of the police officer and is recorded for police intelligence purposes to assist in subsequent identification. It uses six broad ethnic categories (plus 'unknown') whereas census data is based on 16 ethnic groups self-reported by individuals.
|Gender||Ethnic appearance||Current age as at 31 March 2009||Profiles retained at 31 March 2009||Current age as at 31 March 2008||Profiles retained at 31 March 2008|
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