Practically speaking, the federal government could nudge the provinces at federal-provincial meetings of attorneys general, but really, they can do whatever they want in terms of best practices. I'm very persuaded personally, by the way, about using the health card. Should the federal government perhaps be giving seed funds or starting a pilot project, something to get the provinces to do the right thing?
What happened in Saskatchewan is an abomination, and Justice Iacobucci had serious problems with what happens in Ontario, too. This is a national problem.