Strangely enough, the Identification of Criminals Act allows persons to be fingerprinted, photographed, or subjected to such other measurements, processes, and operations having the object of identifying persons as are approved by order of the governor in council. In theory, we could have brought in DNA on arrest by a regulation under the Identification of Criminals Act, but that is not a move we're prepared to do without parliamentary direction.
On February 24th, 2009. See this statement in context.