These are administrative data. They're the basic, ongoing records that CSC has of all prisoners, including those in structured intervention units.
Any administrative data I've worked on from the last 50 years has had errors in it, but there's no reason to believe the errors would be in any particular direction. We found some things that were obviously errors, but the story that they tell is consistent. It's consistent across time and locations. You can see certain things that are errors, but we have confidence in those.
Among other things, Correctional Service of Canada is required by law to keep these data. This is nothing new for them. My suspicion is that they simply didn't like what those data told us.