Evidence of out-of-court experiments or demonstration burns is admissible where the conditions are sufficiently similar to those of the event in question; the conditions need not be identical, and minor variations affect weight rather than admissibility. A McKinney direction is not required where confessions are videotaped and the circumstances of isolation and vulnerability identified in McKinney are absent. New expert evidence that would have been available at trial with reasonable diligence will not be admitted on appeal unless it establishes the appellant's innocence or raises such a doubt about guilt that the verdict should not stand.
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