In Snell v. Farrell, 1990 CanLII 70 (SCC), [1990] 2 S.C.R. 311 (S.C.C.) the court stated that the “but for” causation test was not to be applied too rigidly and that causation need not be determined with scientific precision. The causation test is “essentially a practical question of fact which can best be answered by ordinary common sense” (page 328 per Sopinka J.)
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