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838Rh enforcement actions requested by respondents is therefore not subject to judicial review under the APA. The general exception to reviewability provided by § 701(a)(2) for action "committed to agency discretion" remains a narrow one, see Citizens to Preserve Overton Park v. Volpe, 401 U. S. 402 (1971), but within that exception are included agency refusals to institute investigative or enforcement proceedings, unless Congress has indicated otherwise. In so holding, we essentially leave to Congress, and not to the courts, the decision as to whether an agency's refusal to institute proceedings should be judicially reviewable. No colorable claim is made in this case that the agency's refusal to institute proceedings violated any constitutional rights of respondents, and we do not address the issue that would be raised in such a case. Cf. Johnson v. Robison, 415 U. S. 361, 366 (1974); Yick Wo v. Hopkins, 118 U. S. 356, 372–374 (1886). The fact that the drugs involved in this case are ultimately to be used in imposing the death penalty must not lead this Court or other courts to import profound differences of opinion over the meaning of the Eighth Amendment to the United States Constitution into the domain of administrative law.

The judgment of the Court of Appeals is Reversed.  , concurring.

Today the Court holds that individual decisions of the Food and Drug Administration not to take enforcement action in response to citizen requests are presumptively not reviewable under the Administrative Procedure Act, 5 U. S. C. §§ 701–706. I concur in this decision. This general presumption is based on the view that, in the normal course of events, Congress intends to allow broad discretion for its administrative agencies to make particular enforcement decisions, and there often may not exist readily discernible "law to apply" for courts to conduct judicial review of nonenforcement decisions. See Citizens to Preserve Overton Park v. Volpe, 401 U. S. 402, 410 (1971). 