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Opinion of the Court
conduct—are nowhere to be found in § 3621(e)(2)(B). Beyond instructing that the Bureau has discretion to reduce the period of imprisonment for a nonviolent offender who successfully completes drug treatment, Congress has not identified any further circumstance in which the Bureau either must grant the reduction, or is forbidden to do so. In this familiar situation, where Congress has enacted a law that does not answer "the precise question at issue," all we must decide is whether the Bureau, the agency empowered to administer the early release program, has filled the statutory gap "in a way that is reasonable in light of the legislature's revealed design." NationsBank of N. C., N. A. v. Variable Annuity Life Ins. Co., 513 U. S. 251, 257 (1995) (citing Chevron, 467 U. S., at 842); see also Reno v. Koray, 515 U. S. 50, 61 (1995) (deferring to BOP's interpretation of statute). We think the agency's interpretation is reasonable both in taking account of preconviction conduct and in making categorical exclusions.
First, as the dissent but not Lopez recognizes, see post, at 248, the Bureau need not blind itself to preconviction conduct that the agency reasonably views as jeopardizing life and limb. By denying eligibility to violent offenders, the statute manifests congressional concern for preconviction behavior—and for the very conduct leading to conviction. The Bureau may reasonably attend to these factors as well. Its regulation in this regard is kin to the Attorney General's order upheld in INS v. Yueh-Shaio Yang, 519 U. S. 26 (1996). That case involved a statute authorizing the Attorney General to waive deportation of aliens deportable for entry fraud. The Attorney General had refused to waive deportation for one alien because of "acts of fraud . . . in connection with his entry." Id., at 27. The alien argued that because the statute made aliens who had committed entry fraud eligible for waiver, the Attorney General was precluded from taking such conduct into account "at all" in deciding whether to grant relief. Id., at 30. We rejected this view, stating
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