A trial judge in a court of general jurisdiction who makes findings of fact based on personal medical knowledge, rather than the evidence, commits an error of law and denies procedural fairness, even where the judge has extensive experience in personal injury litigation. Credit findings based on such personal knowledge are not protected by the advantage of seeing and hearing the witness. However, a judge may advise the parties of a particular understanding of medical evidence and, if all parties agree, may act on that understanding without breach of procedural fairness.
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