56
Opinion of the Court
The Government contends that the phrase "official detention" in § 3585(b) refers to a court order detaining a defendant and committing him to the custody of the Attorney General for confinement. Respondent, on the other hand, argues that the phrase "official detention" includes the restrictive conditions of his release on bail because the Federal Magistrate's bail order was "official" and significantly curtailed his liberty. Viewing the phrase in isolation, it may be said that either reading is plausible. But it is a "fundamental principle of statutory construction (and, indeed, of language itself) that the meaning of a word cannot be determined in isolation, but must be drawn from the context in which it is used." Deal v. United States, 508 U. S. 129, 132 (1993). After examining the phrase "official detention" in this light, we believe the Government's interpretation is the correct one.
Section 3585(b) provides credit for time "spent in official detention prior to the date the sentence commences," 18 U. S. C. § 3585(b) (emphasis added), thus making clear that credit is awarded only for presentence restraints on liberty. Because the Bail Reform Act of 1984, 18 U. S. C. § 3141 et seq., is the body of law that authorizes federal courts to place presentence restraints on a defendant's liberty, see § 3142(a) (authorizing courts to impose restraints on the defendant "pending trial"); § 3143(a) (authorizing courts to impose restraints while the defendant "is waiting imposition or execution of sentence"), the "official detention" language of § 3585(b) must be construed in conjunction with that Act. This is especially so because the Bail Reform Act of 1984 was enacted in the same statute as the Sentencing Reform Act of
ment is not properly before the Court. See United Parcel Service, Inc. v. Mitchell, 451 U. S. 56, 60, n. 2 (1981) (noting that this Court does not decide issues raised by amici that were not decided by the court of appeals or argued by the interested party); Bell v. Wolfish, 441 U. S. 520, 531, n. 13 (1979) (same).
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