The principle of incontrovertibility of judicial decisions, previously developed in relation to acquittals, extends to convictions. Where the incontrovertibility principle is engaged but the earlier verdicts were entered without a hearing on the merits, the justification for protecting the earlier decision from contradiction is significantly diminished, and the public interest in prosecuting serious crimes (particularly murder) may prevail. For double jeopardy purposes, a trial commences at arraignment, not empanelment. Facts agreed in sentencing proceedings are not protected by the incontrovertibility principle.
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