Cite as: 532 U. S. 483 (2001)
Opinion of the Court
Court of Appeals erred when it held that medical necessity is a "legally cognizable defense." 190 F. 3d, at 1114. It further erred when it instructed the District Court on remand to consider "the criteria for a medical necessity exemption, and, should it modify the injunction, to set forth those criteria in the modification order." Id., at 1115.
III
The Cooperative contends that, even if the Controlled Substances Act forecloses the medical necessity defense, there is an alternative ground for affirming the Court of Appeals. This case, the Cooperative reminds us, arises from a motion to modify an injunction to permit distributions that are medically necessary. According to the Cooperative, the Court of Appeals was correct that the District Court had "broad equitable discretion" to tailor the injunctive relief to account for medical necessity, irrespective of whether there is a legal defense of necessity in the statute. Id., at 1114. To sustain the judgment below, the argument goes, we need only reaffirm that federal courts, in the exercise of their equity jurisdiction, have discretion to modify an injunction based upon a weighing of the public interest.8
We disagree. Although district courts whose equity powers have been properly invoked indeed have discretion in fashioning injunctive relief (in the absence of a statutory restriction), the Court of Appeals erred concerning the factors that the district courts may consider in exercising such discretion.
federal criminal code, we are not at liberty to rewrite it. Nor are we passing today on a constitutional question, such as whether the Controlled Substances Act exceeds Congress' power under the Commerce Clause.
8 Notwithstanding Justice Stevens' concerns, post, at 502-503, it is appropriate for us to address this issue because this case arises from a motion to modify the injunction, because the Court of Appeals held that the District Court misconstrued its equitable discretion, and because the Cooperative offers this conclusion as an alternative ground for affirmance.
495
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