Where two factors,each of which is sufficient to bring about the harm in question,together cause a harm,the "but for" rule of causation is not useful.

Question

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The "but for" rule of causation, which asks whether the harm would have occurred "but for" the defendant's conduct, is not useful in situations where two factors are each sufficient to cause the harm because the harm would have occurred regardless of the presence of either factor alone.

Where Two Factors,each of Which Is Sufficient to Bring About