I'll try to break your question down into parts. You began with some statements to the effect that in a way we were creating a presumption of guilt. Guilt, of course, is not part of this particular exercise. We are already past the point of guilt. We've established three convictions here. Any presumption that presumes guilt would, in my view, be manifestly unconstitutional, and those kinds of presumptions are not presumptions that have been advanced in the Criminal Code or elsewhere.
We're talking about reverse onus provisions. As to the question about how one addresses the justifiability of reverse onus provisions, the determining question is whether the presumption itself, the reverse onus, is justifiable. Basically this stems from the Supreme Court of Canada decision in Oakes, which is the leading decision on section 1 of the charter, and basically that court case says that facts that are not rationally open to an individual to prove or disprove cannot be justified. A rational connection has to exist between the proved fact--in this case we're dealing with three convictions--and the presumed fact. The presumed fact has to do with the linkage between those convictions, those designated offences, and dangerousness.
You asked the question about whether these provisions have been upheld in the jurisprudence. Reverse onuses and mandatory presumptions are treated the same and they can constitute a reasonable limitation that is justifiable under section 1 of the charter, and the courts have dealt with this in many cases: the Whyte case in 1988 dealing with care and control of a motor vehicle; the Holmes case, also in 1988, dealing with possession of housebreaking instruments; the Keegstra case dealing with the wilful promotion of hatred; the Chaulk case dealing with the presumption of sanity; the Downey case dealing with association with prostitutes; and the Pearson case dealing with reasonable bail.
These are cases, but this is not to suggest that there are not also cases where the courts have found constitutional infringement. These kinds of cases do throw up litigation, and no one is denying that a statutory provision that creates a reversal of onus will not throw off litigation.
One of the complicating factors, for those who choose to challenge this legislation, will be overcoming the idea that this is not an issue going to guilt and innocence and therefore does not fall within section 11 of the charter dealing with the presumption of innocence; but rather they will have to find shelter, if you want to call it that, under section 7 of the charter, and that may lead to a different kind of consideration.