Your premise is a good one if you consider that the intercepted information is already a possible threat. That said, a person who is trying to recruit a Canadian does not ask, during their first conversation, if they are ready to kill for their country. That is rare. These people test the waters, evaluate their target and have mundane conversations, no matter who they recruit. The conversation is of no interest with regard to a possible threat because these people are only testing the waters.
Is that not a problem? At what point does the mundane conversation turn into a threat?