There is an unresolved question whether the Robinson Helicopter test ('glaringly improbable' or 'contrary to compelling inferences') applies to appellate review of inferences drawn from established facts, or only to primary findings of fact. Where a trial judge's conclusion rests on inferences from established facts and credibility findings played little role, the appellate court is in as good a position as the trial judge to draw its own conclusions. The question whether the Robinson Helicopter standard applies to inferences remains open.
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