Oh, if the issue is whether we should be collecting from people post-conviction or at time of arrest, then it would be from the Supreme Court of Canada's decision in the Rodgers case. They could make very little distinction between DNA and fingerprints for the purposes of simply revealing identification information, and that's what it's used for. So, in essence, we could treat them both the same.
On February 24th, 2009. See this statement in context.