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Terrorism Bill

I am most grateful to the noble Baroness. As we are still in Committee, I shall exercise the scope that that gives me to press her a little further. Let us suppose that the security services say to the prosecutor: ““In these particular circumstances, if you, Mr Prosecutor, use intercept evidence which is probative, we are completely happy about that because the intercept evidence you are going to use will not threaten in any way the security of our sources””. Why in those circumstances can the prosecutor not use probative evidence to prosecute a terrorist rather than have to use control orders or other means which would subject the citizen to a long period of detention without trial?