known_biases: Rests on classified sourcing that is not independently verifiable; public products are low/moderate-confidence summaries that may omit or overstate the underlying reporting, are politically salient, and draw on a shared pool of human/signals intelligence — so every US-government origin assertion resting on it (State Dept fact sheet, ODNI assessments) can move together with the same underlying evidence and correlated agency-groupthink risk. (Absorbed duplicate D-7, same basis.)