The “but for” causation test must be applied in a robust common sense fashion. There is no need for scientific evidence of the precise contribution the defendant’s negligence made to the injury. See Wilsher v. Essex Area Health Authority, [1988] A.C. 1074 (H.L.), at p. 1090, per Lord Bridge; Snell v. Farrell, 1990 CanLII 70 (SCC), [1990] 2 S.C.R. 311.
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