334
Opinion of the Court
tenced Wilson on November 29, 1989, but Wilson did not begin his sentence until December 12, 1989. At sentencing, the District Court only could have speculated about the amount of time that Wilson would spend in detention prior to the commencement of his sentence; the court did not know when the state-court proceedings would end or when the federal authorities would take Wilson into custody. Because § 3585(b) bases the credit on how much time a defendant "has spent" (not "will have spent") prior to beginning his sentence, the District Court could not compute the amount of the credit at sentencing.
The final phrase of § 3585(b) confirms this interpretation. As noted above, it authorizes credit only for time that "has not been credited against another sentence." Wilson argues that this phrase does not prevent him from receiving credit because his official detention "ha[d] not been credited" against the state sentence when the District Court imposed the federal sentence. Under this logic, however, if the District Court had sentenced Wilson a few weeks later than it did, he would not have received credit under § 3585(b). This interpretation of the statute would make the award of credit arbitrary, a result not to be presumed lightly. See United States v. Turkette, 452 U. S. 576, 580 (1981) (absurd results are to be avoided). We can imagine no reason why Congress would desire the presentence detention credit, which determines how much time an offender spends in prison, to depend on the timing of his sentencing. For these reasons, we conclude that § 3585(b) does not authorize a district court to compute the credit at sentencing.
B
We agree with the United States that the Attorney General must continue to compute the credit under § 3585(b) as he did under the former § 3568. When Congress writes a statute in the passive voice, it often fails to indicate who must take a required action. This silence can make the
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