What are the duties of a police officer in common law?

British Columbia, Canada

The following excerpt is from R. v. Crocker, 2011 BCSC 1361 (CanLII):

At common law, the duties of police officers include the preservation of the peace, the prevention of crime and the protection of life and property: Dedman v. The Queen, 1985 CanLII 41 (SCC), [1985] 2 S.C.R. 2 at 11-12.

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