jurisdiction over drugs used to put animals to sleep[1] and the unapproved uses of drugs on prisoners in clinical experiments, the court found that the FDA's refusal, for the reasons given, was irrational, and that respondents' evidence that use of the drugs could lead to a cruel and protracted death was entitled to more searching consideration. The court therefore remanded the case to the District Court, to order the FDA "to fulfill its statutory function."
The dissenting judge expressed the view that an agency's decision not to institute enforcement action generally is unreviewable, and that such exercises of "prosecutorial discretion" presumptively fall within the APA's exception for agency actions "committed to agency discretion by law." He noted that traditionally courts have been wary of second-guessing agency decisions not to enforce, given the agency's expertise and better understanding of its enforcement policies and available resources. He likewise concluded that nothing in the FDCA or FDA regulations would provide a basis for a court's review of this agency decision. A divided Court of Appeals denied the petition for rehearing. 233 U. S. App. D. C. 146, 724 F. 2d 1030 (1984). We granted certiorari to review the implausible result that the FDA is required to exercise its enforcement power to ensure that States only use drugs that are "safe and effective" for human execution. 467 U. S. 1251 (1984). We reverse.
II
The Court of Appeals' decision addressed three questions: (1) whether the FDA had jurisdiction to undertake the enforcement actions requested, (2) whether if it did have juris-
- ↑ In response to respondents' petition, the Commissioner had explained that the FDA had assumed jurisdiction in these cases because, unlike the drugs used for human execution, these drugs were "new drugs" intended by the manufacturer to be used for this purpose, and thus fell squarely within the FDA's approval jurisdiction. The Court of Appeals did not explain why this distinction was not "rational."
