Knowledge obtained by a juror about an accused's family history of violence (here, the accused's father killing her mother) does not give rise to a miscarriage of justice where there is no logical basis for impermissible tendency or coincidence reasoning — the circumstances and motive for spousal killing being quite different from those for killing one's own children. Extraneous information obtained by a juror that would, if anything, assist the defence does not constitute a material irregularity. The Weiss proviso applies where the Crown case is overwhelming notwithstanding jury irregularities.
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