Declassified

Declassification is the process by which government documents previously marked as classified — Confidential, Secret, or Top Secret — are released for public access. In the United States, this process is governed by Executive Order 13526, which establishes automatic declassification timelines and procedures for mandatory review requests.

Documents are typically classified to protect national security, intelligence sources and methods, diplomatic relations, or ongoing operations. The original classification authority sets a declassification date, usually 10 or 25 years from creation. In practice, many documents remain classified far beyond their original timeline due to bureaucratic inertia, agency resistance, or blanket exemptions for entire categories of records.

The declassification of government documents has been the single most important mechanism for confirming claims previously dismissed as conspiracy theories. Declassified CIA documents confirmed MKUltra. Declassified NSA records confirmed warrantless wiretapping programs. Declassified military records confirmed biological weapons testing on American cities. Declassified State Department cables confirmed U.S. involvement in foreign coups.

The National Declassification Center, established in 2009, processes millions of pages annually but faces a backlog estimated at hundreds of millions of pages. The Interagency Security Classification Appeals Panel (ISCAP) handles appeals when agencies refuse to declassify specific documents.

For researchers and the public, declassified documents represent the gold standard of evidence — the government's own records confirming what officials previously denied. On They Knew, declassified documents rank second in our source hierarchy, just below direct government admissions.