What are the risks of attaching excessive weight to police testimony?

Canada (Federal), Canada

The following excerpt is from R. v. MacKenzie, 2013 SCC 50 (CanLII):

The risks of attaching excessive weight to police testimony have long been recognized in the jurisprudence. In Graat v. The Queen, 1982 CanLII 33 (SCC), [1982] 2 S.C.R. 819, at p. 840, for example, Dickson J. (as he then was) advised that “there may be a tendency for judges and juries to let the opinion of police witnesses overwhelm the opinion evidence of other witnesses”.

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