Photo of David Davis

David Davis (Shadow Home Secretary (Assisted By Shadow Law Officers), Home Affairs; Haltemprice and Howden, Conservative)

To ask the Secretary of State for the Home Department how many people arrested in each financial year since 1995 who were (a) under 16, (b) 16 to 18, (c) 19 to 21 and (d) over 21 years at the time of their arrest had their DNA profiles added to the National DNA Database; and how many have subsequently had those profiles removed from the database in each case.

Photo of John Reid

John Reid (Home Secretary; Airdrie and Shotts, Labour)

The information requested on arrests is not available centrally. Information on arrests held by the Office for Criminal Justice Reform is based on aggregated data collected at police force area level covering persons arrested for recorded crime (notifiable offences) by gender, specific age groups (under 10, 10 to 17,18 to 20, 21 and over and unknown), ethnicity and by main offence group only.

Available information relating to subject sample profiles added to the National DNA Database in each financial year since 1995 to date by age group is set out in table 1.

The number of subject sample profiles subsequently removed from the National DNA Database is given in table 2 as follows.

Table 1: N umber of DNA subject sample profiles added to the National DNA Database in each year from 1995-96 to 2006-07
1995-96 1996-97 1997-198 1998-99 1999-2000 2000-01
Under 16 2,507 4,964 7,886 18,764 21,055 47,735
16 to 18 5,977 14,137 20,152 37,696 31,902 59,088
19 to 20 3,923 9,511 12,888 24,395 20,290 37,978
21 and over 21,718 52,968 85,970 152,964 121,761 233,312
Unknown age on load 2 8 13 9 3 6
Total 34,127 81,588 126,909 233,828 195,011 378,119
2001-02 2002-03 2003-04 2004-05 2005-06 2006-07
Under 16 60,972 55,226 56,033 68,381 87,459 90,919
16 to 18 70,534 62,823 59,403 66,954 86,052 88,522
19 to 20 43,930 38,844 36,911 37,542 49,801 51,005
21 and over 296,445 287,468 279,350 307,393 402,427 437,229
Unknown age on load 15 33 26 16 58 62
Total 471,896 444,394 431,723 480,286 625,797 667,737
Total added 1995-2007 4,171,415
Notes:

1. The data are for subject sample profiles taken by forces in England and Wales only (and include profiles taken from volunteers). They do not include profiles taken by Scottish forces, the Police Service for Northern Ireland, Guernsey etc.

2. The data give the age of persons when their profile was loaded to the National DNA Database (NDNAD) in each of the financial years. There are a number of subject sample profiles loaded in each financial year for which the date of birth and also therefore the age on load is unknown.

3. The age figures should be treated with caution as there are some data quality issues relating to the recording of dates of birth on the Police National Computer (PNC) by arresting police officers. Key demographic data such as the DOB data are transferred electronically from the PNC to NDNAD.

4. There are 37,804 subject sample profile records on the database for which there is no record of the financial year when they were loaded to the NDNAD. These records have not been included in the count.

5. The figures given are the numbers of DNA subject sample profiles added to the NDNAD. There are more DNA profiles held on the NDNAD than there are individuals due to DNA samples being taken from some individuals on more than one occasion (i.e. due to replicate sampling). A study into the rate of replication on the NDNAD was first carried out in 2003. Using the rate of replication, it is possible to estimate the number of individuals on the database from the number of profiles. However, as the replication rate before 2003 is unknown, to ensure consistency, the data given are the number of profiles and not individuals. The estimated rate of replication on the database for the years since 2003 is as follows:

The estimated replication rate for financial year 2003-04 was 10 per cent.

The estimated replication rate for financial year 2004-05 was 10 per cent.

The estimated replication rate for financial year 2005-06 was 11 per cent.

The estimated replication rate for the end of financial year 2006-07 was 13.7 per cent.

Table 2: N umber of subject sample profiles removed from the national DNA database
2002-03 2003-04 2004-05 2005-06 2006-07
Under 16 40 5 12 29 22
16 to 18 42 4 7 17 11
19 to 20 28 6 4 8 4
21 and over 146 30 30 111 78
Unknown age on load 0 0 0 0 0
Total 256 45 53 165 115
Notes:

1. The data are for subject sample profiles taken by forces in England and Wales only.

2. The data show the number of profiles loaded in each financial year (FY) since 2002-03 to date which have since been deleted in any subsequent year i.e. 256 subject profiles loaded in FY 2002-03 have since been deleted in the period between 2002-03 and 31 March 2007.

3. Some limited information is available on the number of profiles removed between 1995 and 2002. This is by calendar year only, and no age breakdown is available. In 2002, a management information database was created which enabled more detailed information to be captured.

4. As the data represent the number of persons whose profiles have been removed from the database, it is not necessary to apply a replication rate to the figures.

Annotations

David Mery
Posted on 18 Mar 2008 11:16 pm (Report this annotation)

See http://www.theyworkforyou.com/wrans/?id=2008-01-08a.167011.h for another spin on the number of subject sample profiles removed from the national DNA database.

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