R v Sylvain, 2014 ABCA 153
[94] Third, the appellant cites R. v I.I., 2013 ABCA 2, 542 AR 52, and argues that the Crown only cross-examined him on collateral points. I.I. does not stand for the proposition that the Crown has an obligation to cross-examine an accused person on any particular topic. I.I. is a case about juries, and when and how a jury should be instructed when the Crown adopts a particular strategy at trial: I.I. at para. 13.
[95] The purpose of cross-examination is to explore the evidence of the witness, exposing weaknesses, biases, and inaccuracies, and thereby assist in the truth finding process. It has been said that cross-examination is more an art than a science, and the selection of appropriate questions and topics for cross-examination is one of the key skills of legal advocacy: E.F.B. Johnston, Q.C., The Art of Cross Examination, [1936] 2 DLR 673.
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