Koon v. United States, 518 U.S. 81, 22 (1996)

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82

KOON v. UNITED STATES

Syllabus

intro. comment. 4(b). The Commission prohibits consideration of a few factors, and it provides guidance as to the factors that are likely to make a case atypical by delineating certain of them as "encouraged" bases for departure and others as "discouraged" bases for departure. Courts may depart on the basis of an encouraged factor if the applicable Guideline does not already take the factor into account. A court may depart on the basis of a discouraged factor, or an encouraged factor already taken into account, however, only if the factor is present to an exceptional degree or in some other way makes the case different from the ordinary case. If the Guidelines do not mention a factor, the court must, after considering the structure and theory of relevant individual Guidelines and the Guidelines as a whole, decide whether the factor is sufficiently unusual to take the case out of the Guideline's heartland, bearing in mind the Commission's expectation that departures based on factors not mentioned in the Guidelines will be "highly infrequent." Pp. 92-96. (b) Although 18 U. S. C. § 3742 established a limited appellate review of sentencing decisions, § 3742(e)(4)'s direction to "give due deference to the district court's application of the guidelines to the facts" demonstrates that the Act was not intended to vest in appellate courts wide-ranging authority over district court sentencing decisions. See, e. g., Williams v. United States, 503 U. S. 193, 205. The deference that is due depends on the nature of the question presented. A departure decision will in most cases be due substantial deference, for it embodies the sentencing court's traditional exercise of discretion. See Mistretta v. United States, 488 U. S. 361, 367. To determine if a departure is appropriate, the district court must make a refined assessment of the many facts that bear on the outcome, informed by its vantage point and dayto-day sentencing experience. Whether a given factor is present to a degree not adequately considered by the Commission, or whether a discouraged factor nonetheless justifies departure because it is present in some unusual or exceptional way, are matters determined in large part by comparison with the facts of other Guidelines cases. District courts have an institutional advantage over appellate courts in making these sorts of determinations, especially given that they see so many more Guidelines cases. Such considerations require adoption of the abuse-of-discretion standard of review, not de novo review. See, e. g., Cooter & Gell v. Hartmarx Corp., 496 U. S. 384, 403. Pp. 96-100. 2. Because the Court of Appeals erred in rejecting certain of the downward departure factors relied upon by the District Judge, the foregoing principles require reversal of the appellate court's rulings in significant part. Pp. 100-114.

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