In a passage oft-quoted from Rothman v. The Queen, 1981 CanLII 23 (SCC),  1 S.C.R. 640 at 697, Mr. Justice Lamer (as he then was) said this: It must also be borne in mind that the investigation of crime and the detection of criminals is not a game to be governed by the Marquess of Queensbury rules. The authorities, in dealing with shrewd and often sophisticated criminals, must sometimes of necessity resort to tricks or other forms of deceit and should not through the rule be hampered in their work. What should be repressed vigorously is conduct on their part that shocks the community.
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