What is the role of a judge as a gatekeeper for expert evidence at trial?

Ontario, Canada

The following excerpt is from Moffitt v. TD Canada Trust, 2021 ONSC 6133 (CanLII):

White Burgess clearly acknowledges the role of the judge as the gatekeeper to ensure that expert evidence is properly scrutinized before it is admitted as evidence. The role of the trial judge as the gatekeeper for expert evidence, and the responsibility of the trial judge to carefully scrutinize expert evidence before admitting it were also discussed by our Court of Appeal in Bruff-Murphy v. Gunawardena, 2017 ONCA 502, 138 O.R. (3d) 584.

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