Yes, of course. Canadian Security Intelligence Service members have tools available to them under the act that only they have. They were involved in the fact-finding and the investigation all the way along. It wasn't until the later stages of that investigation that they were able to obtain the information that informed that June 30 letter.
For example, under a letter of April 9, they had not yet found the information that was available to them later. That letter suggested that there still was no reason to suggest that the scientists had willingly co-operated or that they were vulnerable. Clearly, in the intervening time between April 9 and June 30, their investigations and their tools uncovered information that radically changed that assessment, and we acted immediately upon receiving that information.
This was a case in which people took steps to hide their activities, and the national security and law enforcement investigations were deploying all their tools throughout to try to uncover additional evidence. They eventually did so on June 30.