Il n'est généralement pas permis de poser des questions suggestives à son témoin en interrogatoire principal

R. v. Rose, 2001 CanLII 24079 (ON CA)

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[9] A leading question is one that suggests the answer. It is trite law that the party who calls a witness is generally not permitted to ask the witness leading questions. The reason for the rule arises from a concern that the witness, who in many instances favours the party who calls him or her, will readily agree to the suggestions put in the form of a question rather than give his or her own answers to the questions. Of course, the degree of concern that may arise from the use of leading questions will depend on the particular circumstances and the rule is applied with some flexibility. For example, leading questions are routinely asked to elicit a witness' evidence on preliminary and non-contentious matters. This practice is adopted for the sake of expediency and generally gives rise to no concern. Leading questions are also permitted to the extent that they are necessary to direct the witness to a particular matter or field of inquiry. Apart from these specific examples, the trial judge has a general discretion to allow leading questions whenever it is considered necessary in the interests of justice: Reference Re R. v. Coffin, 1956 CanLII 94 (SCC), [1956] S.C.R. 191, 114 C.C.C. 1 at pp. 211-12 S.C.R., p. 22 C.C.C.