Of course, Premier Wall threatened to use it in 2015, after a Supreme Court decision on his labour legislation.  He backed off.  Wall appears to be the stalking horse for the federal Conservatives on this issue.

By the way, Quebec last relied on section 33 in 1993 (imposed in 1988).  However, Alberta inserted it in a law in 2000 to try to prevent same sex marriage in that province. 

I'm with the Saskatchewan law professor who told the CBC this yesterday:
"Instead of respecting the judicial process, and doing what everyone else has to do and take its case up to the appeal court ... instead of that, we have a premier saying, 'If need be, we're going to shift into Defcon mode here."

And in case you think "Defcon mode" is too strong, someone we both know well once wrote that "Invoking the notwithstanding clause is the political equivalent of nuclear warfare." Same guy also said: "The notwithstanding clause is an ugly boil on an otherwise beautiful document."