It's difficult to speculate. To tie this back in to your question about the limitation period, the 2,4-D ban was enacted by Quebec in April 2006, so by my math, we would be in theory coming up quite close to this limitation period. However, there's an open issue as to whether or not this measure is an ongoing measure. The ban is still in place, so I'm uncertain and don't have an answer as to whether or not a limitation period issue is raised here in this case.
On March 24th, 2009. See this statement in context.