Ce que la Cour d'appel de l'Ontario considère comme étant le moyen le plus précieux d'apprécier la crédibilité d'un témoin

R. v. M.G., 1994 CanLII 8733 (ON CA)

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[27]           Probably the most valuable means of assessing the credibility of a crucial witness is to examine the consistency between what the witness said in the witness-box and what the witness has said on other occasions, whether on oath or not. Inconsistencies on minor matters or matters of detail are normal and are to be expected. They do not generally affect the credibility of the witness. This is particularly true in cases of young persons. But where the inconsistency involves a material matter about which an honest witness is unlikely to be mistaken, the inconsistency can demonstrate a carelessness with the truth. The trier of fact is then placed in the dilemma of trying to decide whether or not it can rely upon the testimony of a witness who has demonstrated carelessness with the truth.