625 F.3d 766 (D.C. Cir. 2010)

Held that prolonged warrantless GPS tracking of a vehicle constitutes a search under the Fourth Amendment. Later affirmed by the Supreme Court in United States v. Jones (2012), which established that physical trespass to install a GPS device is a search. Foundational digital privacy decision.

758 F.3d 390 (D.C. Cir. 2014)

Initially held that the Affordable Care Act does not authorize tax subsidies for insurance purchased on federally established exchanges, only state-established exchanges. The panel decision was later vacated when the en banc court agreed to rehear the case, and the issue was ultimately resolved by the Supreme Court in King v. Burwell.

696 F.3d 7 (D.C. Cir. 2012)

Vacated EPA's Cross-State Air Pollution Rule (Transport Rule), finding the agency exceeded its authority under the Clean Air Act by requiring upwind states to reduce emissions beyond their own contributions to downwind air quality violations. Later reversed by the Supreme Court in EPA v. EME Homer City Generation.

985 F.3d 1032 (D.C. Cir. 2021)

Upheld a district court order requiring the Army Corps of Engineers to prepare a full environmental impact statement for the Dakota Access Pipeline's crossing under Lake Oahe. The court found that the Corps had failed to adequately consider the pipeline's potential environmental justice impacts on the Standing Rock Sioux Tribe.

725 F.3d 197 (D.C. Cir. 2013)

Held that the President has exclusive authority to recognize foreign sovereigns and their territorial bounds, invalidating a congressional statute requiring the State Department to record 'Israel' as the birthplace of U.S. citizens born in Jerusalem upon request. Later affirmed by the Supreme Court in Zivotofsky v. Kerry.