Where a trial judge makes positive findings, based on accepted expert evidence, that all of a plaintiff's disabilities are explained by a pre-existing condition (here, schizoaffective disorder), the [name withheld] v [name withheld] requirement for the defendant to disentangle the contributions of the pre-existing condition and the accident-related injuries does not arise. The case confirms that the evidential onus on the defendant to disentangle is displaced where the trial judge positively finds that the plaintiff's condition is wholly attributable to the pre-existing condition rather than the tortious injury.
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