In this article, application of the United States Sentencing Guidelines among district court judges adjudicating substantially similar drug cases is compared. When district court judges use the Guidelines, either applying ranges from the sentencing table or explicitly departing from them, average sentences and sentence variation among the circuits analyzed are very similar. However, rates of departure from the Guidelines by district court judges in some cir- cuirs vary significantly. Further, district court judges in the circuits analyzed reacted differ- ently than judges nationwide to three significant legal events: the PROTECT Act (2003) (limiting judicial discretion), Blakely v. Washington (2004), and United States v. Booker (2005) (expanding judicial discretion). This analysis suggests that long-existing federal Sentencing Guideline schemes, whether mandatory or advisory, reduce disparities m sentences when judges apply the Guideline ranges, but not disparities associated with the choice of whether to apply those ranges.
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