Standing

Standing is a threshold requirement grounded in Article III's "Cases or Controversies" clause. Federal courts only resolve actual disputes between parties with real interests at stake. Standing doctrine requires plaintiffs to show three elements: they've suffered an injury-in-fact (concrete, particularized, actual or imminent), the defendant's conduct caused the injury, and a favorable court ruling would likely remedy it. Without standing, a plaintiff can't sue, even if the defendant's action violates law.

In practice, standing doctrine blocks many potential litigants. In Lujan v. Defenders of Wildlife, the Supreme Court barred environmentalists from challenging an agency rule on endangered species because their planned future trips to see animals weren't concrete enough—mere interest in a program doesn't create standing. Mass harms—widespread surveillance, environmental pollution accumulating over time, government secrecy—often can't clear the standing threshold because no individual can prove the formula of injury, causation, and redressability. This means some constitutional violations go unchecked not because they're constitutional, but because no one qualifies to sue.

Standing doctrine serves important judicial functions: it keeps courts from issuing advisory opinions, ensures plaintiffs have incentive to litigate carefully, and preserves separation of powers by limiting when courts can second-guess coordinate branches. But standing also functions as a political barrier: citizens with genuine grievances may find federal courthouse doors closed because they can't satisfy technical requirements about how they've been harmed.