322 U.S. 665, 671, 64 S.Ct. 1240, 1243, 88 L.Ed. 1525 (1944). Mixed questions of law and fact are even more troubling for standard of review purposes. A mixed question is present when the facts are admitted or established and the law is undisputed; the sole issue is whether the law applied to the facts satisfies the statutory standard. Pullman-Standard v. Swint, 456 U.S. 273, 289, n. 19, 102 S.Ct. 1781, 1790, n. 19, 72 L.Ed.2d 66 (1982). Where the mixed question involves primarily a factual inquiry, the clearly erroneous standard is appropriate. If, however, the mixed question primarily involves the consideration of legal principles, then a de novo review by the appellate court is appropriate. See, e.g., United States v. McConney, 728 F.2d 1195, 1199-1205 (9th Cir.1984) (en banc) (<HOLDING>). Most appellate courts that have reviewed a
recognizing that the constitutionality of a statute is a question of law subject to de novo review holding that the mixed question of exigent circumstance is reviewable de novo as a question of law holding that the question whether a party has agreed to submit an issue to arbitration is a question of law requiring de novo review holding that antitrust standing is question of law reviewed de novo holding that whether the defendants confession was voluntary was a mixed question of law and fact subject to de novo review