I understand all of that and I agree with you. However, you must admit that there can be, under such circumstances, information that, once it has been found, is of such a nature that one can be convinced it is true.
I understand your point of view and recognize that it should not be used as evidence to detain somebody. However, do you understand that security services could use it to draw their own conclusions and therefore organize a defence, organize their surveillance and inform their investigations, using objective evidence that, independently of how it was obtained, could prove extremely useful?