There isn't a specific obligation that the country follow through for years on end to find out the results of the treatment of a detainee that they've transferred. But if Canada had detailed information about abuse that detainees had transferred to the custody of the NDS, if it had that information before it, it could use that in making any future assessment about whether a detainee might face a substantial risk of torture upon transfer.
On May 5th, 2010. See this statement in context.