The rule is of fundamental importance to the workings of a criminal justice system. As described in Bisaillon v. Keable, 1983 CanLII 26 (SCC), [1983] 2 S.C.R. 60, at p. 105: The rule gives a peace officer the power to promise his informers secrecy expressly or by implication, with a guarantee sanctioned by the law that this promise will be kept even in court, and to receive in exchange for this promise information without which it would be extremely difficult for him to carry out his duties and ensure that the criminal law is obeyed.
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