Fundamentally, it's our view--and it's the reason I keep coming back to the search warrant comparison--that what raises the concerns are the manner in which justification is given, the manner in which the justification and intent for resorting to such conduct is recorded, and the scrutiny of resort to these provisions that the public is ultimately going to make.
The regime ought to be subject to judicial oversight. For example, in a large organized crime type of investigation, while the search warrant analogy isn't a perfect one, one could certainly, at a certain stage in the investigation, put information before a justice of the peace or a provincial court judge explaining the nature of the investigation and explaining why, in order to move further into the organization, one has to put an undercover officer in posing as a member of the gang or posing as an underworld individual--someone who, in order to have credibility, must be permitted to engage in certain types of conduct.