I believe you will be hearing from Mr. Jim Bonta of the correctional directorate at Public Safety Canada. He has a great deal of expertise in this area and is much better able to answer those types of questions than I am.
I would add that Correctional Service Canada is perhaps noted around the world as one of the leading agencies, not just for keeping high-risk sexual and violent offenders in prison, but for attempting to analyze and understand what makes them tick in the first place and what types of programs can help treat and cure the propensity for violent sexual behaviour. Essentially we rest much of our analysis for dangerous offender proceedings on the expertise coming from there. From those psychiatric assessments, the judges are now looking for indications that individuals are simply unable to respond to the treatment that state-of-the-art facilities and psychiatric caregivers are providing, and that by failing to respond they show that regardless of how many resources you pour into them they are going to reoffend violently and sexually.
I think Mr. Bonta will be able to provide a lot of detail on that process.