My Lords, the noble Baroness, Lady Hamwee, appears to be right that the legislation in its current form does not place express limits on the use of information obtained from a polygraph for the purpose of extending a TPIM, yet my enthusiasm for Amendment 20 is limited. The reality is that TPIMs can be made and extended on the basis of a wide range of intelligence fragments, some of which may be little more than straws in the wind. It may none the less be important to take such matters into account. I think back to the Manchester Arena bomb and the ambiguous and potentially unreliable intelligence that, as I reported at the time, might, if it had been interpreted in a different way, have resulted in some sort of pre-emptive action.
An intelligence picture is typically a complex mosaic of multiple indications and assessments, of which polygraph material, depending on the circumstances, will not necessarily be the least reliable component. While it seems to me both unlikely and undesirable that a TPIM would ever be extended predominantly on the basis of polygraph material, I am wary of Parliament seeking to dictate the relative weight that is to be given to different sources of intelligence. The Executive and the courts are the bodies with expertise in this area, and I suspect that we should leave it to them.
I look forward to hearing what the Minister has to say about Amendment 19, which seems not without merit.