Tables 4, 5 and 6 show the proportion of tests under DIP which were positive for heroin only, cocaine only, and heroin and cocaine combined, for each financial year since data were available.
Table 4: Heroin only
Percentage
Force
2004-05
2005-06
2006-07
2007-08
2008-09
Avon and Somerset
11
10
8
6
6
Bedfordshire
16
12
7
4
7
Cambridgeshire
20
14
13
10
11
City of London
-
-
7
5
6
Cleveland
23
21
16
13
13
Devon and Cornwall
32
23
22
13
17
Greater Manchester
13
11
10
7
8
Gwent
-
11
17
13
18
Humberside
17
20
15
11
13
Lancashire
26
27
23
20
18
Leicestershire
16
17
13
12
14
Merseyside
11
9
6
6
7
Metropolitan police
8
9
5
4
5
North Wales
31
28
24
16
21
Northamptonshire
-
14
8
6
8
Northumbria
21
18
14
12
10
Nottinghamshire
18
14
11
9
8
South Wales
100
21
24
18
19
South Yorkshire
20
18
14
12
11
Staffordshire
24
25
26
22
17
Thames Valley
11
8
6
6
7
West Midlands
14
17
10
7
8
West Yorkshire
18
17
10
7
7
Table 5: Cocaine only (both powder cocaine and crack cocaine)
Percentage
Force
2004-05
2005-06
2006-07
2007-08
2008-09
Avon and Somerset
15
16
12
15
17
Bedfordshire
14
18
14
17
15
Cambridgeshire
7
6
5
10
10
City of London
-
-
13
15
12
Cleveland
10
11
11
14
13
Devon and Cornwall
3
5
5
8
13
Greater Manchester
11
11
12
16
13
Gwent
-
16
10
13
9
Humberside
7
7
7
10
8
Lancashire
5
6
5
7
10
Leicestershire
10
6
8
9
10
Merseyside
13
13
17
23
21
Metropolitan police
20
17
16
19
18
North Wales
4
6
7
9
9
Northamptonshire
-
13
12
14
13
Northumbria
8
9
11
12
11
Nottinghamshire
11t
9
9
13
12
South Wales
0
8
7
11
10
South Yorkshire
9
8
8
12
10
Staffordshire
7
8
7
8
7
Thames Valley
14
17
14
16
12
West Midlands
11
9
10
14
13
West Yorkshire
8
9
9
13
12
26 Oct 2009 : Column 181W
26 Oct 2009 : Column 182W
Table 6: Both heroin and cocaine (both powder cocaine and crack cocaine)
