Motor Vehicle Manufacturers Assoc. of the United States, Inc. v. State Farm Mutual Auto. Ins. Co.

Holding that " `settled course of behavior embodies the agency's informed judgment that, by pursuing that course, it will carry out the policies [of applicable statutes or regulations]'"

Monsanto Co. v. Geertson Seed Farms

Holding that plaintiffs, alfalfa farmers, had standing based on a causal chain, though plaintiffs did not identify particular alfalfa plants that had been, or would necessarily be, pollinated by bees who carried the genetically engineered gene at issue

Citizens to Preserve Overton Park v. Volpe

Holding a decision is committed to agency discretion when there is "no law to apply"

Bowen v. Georgetown University Hospital

Holding that courts will not defer to an agency's litigating position where it contradicts the agency's prior “regulations, rulings, or administrative practice”

Baltimore Gas & Electric Co. v. Natural Resources Defense Council, Inc.

Holding that "a reviewing court must generally be at its most deferential" when examining an agency decision made "within its area of special expertise, at the frontiers of science"

Davis v. Michigan Dept. of Treasury

Holding that "the relevant inquiry is whether the inconsistent tax treatment is directly related to, and justified by, `significant differences between the two classes'"

Babbitt v. Sweet Home Chap., Coms. for Great Ore

Holding that EPA's interpretation of a statute was reasonable and deserving of deference even though the statute was criminally enforced

United States v. Florida East Coast R. Co.

Holding that a statute's use of the word “hearing” did not “by its own force require [an agency] either to hear oral testimony, to permit cross-examination ..., or to hear oral argument”

General Motors Corp. v. E.P.A

Holding that a letter from an agency that "reflect[ed] neither a new interpretation nor a new policy" did not "impose new obligations"

American Wildlands v. Kempthorne

Holding that an agency's use of available data and test methods was reasonable even though better test methods existed because those test methods had not yet been used on the species in question

Section 706 - Scope of review

Granting courts jurisdiction to "compel agency action unlawfully held or unreasonably delayed"

Section 551 - Definitions

Adopting the definition set out in the APA

Section 553 - Rule making

Exempting "interpretative rules," among other things, from the notice-and-comment requirement

Section 1531 - Congressional findings and declaration of purposes and policy

Finding and declaring that "various species of fish, wildlife, and plants in the United States have been rendered extinct" while "other species ... have been so depleted in numbers that they are in danger of or threatened with extinction ...."

Section 1532 - Definitions

Defining "conservation" as "the use of all methods and procedures which are necessary to bring any endangered species or threatened species to the point at which the measures provided pursuant to this chapter are no longer necessary"

Section 1533 - Determination of endangered species and threatened species

Requiring periodic review of listed species

Section 1538 - Prohibited acts

Defining "take"

Section 109 - Repeal of statutes as affecting existing liabilities

Repealing common law rule

Section 1537a - Convention implementation

Section 17.31 - Prohibitions

Taking of threatened or endangered species

Section 17.8 - Import exemption for threatened, CITES Appendix-II wildlife

Setting conditions for imports of threatened, CITES Appendix II wildlife "[e]xcept as provided in a special rule"