Again, that's a very good question. There have not been any evaluations to date of the national registry, simply because it is too soon. Now that we're in the fifth year of operation, I think researchers would say this is a point at which they can start looking at the impact of the federal registry. As my colleague has pointed out, it's something we intend to pursue as much as possible.
One of the foremost international experts, Dr. Karl Hanson, works in my area as a sex offender researcher, and as Inspector Nezan has said, for most sex offenders, it's a very mixed group, and you really have to focus on different groups. The highest rate of reoffending tends to be among, for example, men who choose young male strangers as victims. Other groups of sex offenders tend to reoffend at a very low rate. They do tend to offend over a longer period of time; that's one of the features of the category.
As for the impact of various registries on reoffending, obviously it's a difficult research question, because sex offences, in terms of police statistics, have gone down considerably over the past decade. There could be any number of reasons contributing to that decline, of course, and the challenge is to try to parse out what impact a registry would have had on that. It's not impossible, but it is challenging.