Generalisation like that belies the fact that it is very difficult to get drugs into prison and that staff do a huge amount of work to ensure that drugs are not there. It is not possible to answer the point that my hon. Friend puts to me, which is essentially a negative, but what I can say is that, as I have told the House, the results of mandatory drug tests show that there has been a 68 per cent. decrease in the use of drugs in prison, which is something for which we should thank the National Offender Management Service.