Nationality, Immigration and Asylum Act 2002 (Juxtaposed Controls) (Amendment) Order 2006

I was wondering how the figure that the noble Lord has given can be said to result from the use of ASOs, bearing in mind that, if they had not been there, identical searches would have been conducted by immigration officers, who presumably would have found those 1,200 people as well. There is not a control group with which you can compare the statistics that have been achieved by ASOs, is there?