One Test to rule them all, One Test to find them,
One Test to bring them together, and in the light of doctrine bind them.(apologies to Tolkien, Lord of The Rings)
Law needs to describe itself as a science, ultimately based on empirically verifiable principles, in order to avoid being nothing more than another form of theology, ultimately based on faith. Faith, by definition, does not require empirical verification. Similarly, Law's principles and rules need to avoid amouting to a form of magic that is fantasy, not merely an instance of knowledge beyond our current understanding. Magic, too, does not need verifiability. It simply is.
Physics has its search for the TOE (Theory of Everything). Canadian tort doctrine, in the area of factual causation, at least as expounded by current Supreme Court of Canada doctrine, apparently has its own TOE, its own one "One Test": the but-for test.
Unfortunately for the SCC, the but-for test when properly understood is not a TOE at all. It is not a theory that explains everything.While it is, in practice, a default test; nonetheless, even as a default test, it is not the all-powerful master test in the sense of the One Ring in Tolkien's Lord of the Rings.* (The LoTR has been endlessly parodied. Two of the best are the Harvard Lampoon's Bored of the Rings - easy enough to find online - and the Jack Black, Sarah Michelle Geller, and others parody of a seminal scene.) Nor, is it even even a positional equivalent of Asimov's Zeroeth Law of Robotics.
(edited June 23, 25)
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