I am grateful to my hon. Friend for promoting this Bill. It is clear that he speaks with great authority on the matter. From reading the notes and listening to him speak, it seems to me that the danger is not just to the people taking the drug. In the case of prescription medicine, residents who are trying to go straight are being bullied by residents who are trying to get the drugs off them. Could he set out how the testing regime he envisages would protect people who are desperately trying to be rehabilitated, go straight and become productive members of society again?