The leading case on causation in medical negligence cases is Snell v. Farrell 1990 CanLII 70 (SCC), [1990] 2 S.C.R. 311. It says that causation need not be determined by scientific precision. Often it is extremely difficult for the plaintiff to prove or the court determine the cause of the injury. Causation is essentially a practical question of fact which can best be answered by ordinary common sense rather than abstract metaphysical theory.
"The most advanced legal research software ever built."
The above passage should not be considered legal advice. Reliable answers to complex legal questions require comprehensive research memos. To learn more visit www.alexi.com.