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What worries me is that the CIA and the other intelligence agencies have considerably damaged their credibility. How do we know if they have thoroughly vetted their source? Can they be trusted if they base a significant claim on one source? It reminds me of the dramatic shift in our assessment of Iran's ambitions. When the NIE came out in late 2007 that was markedly different from previous estimates, it was clear that it was based mostly on Asgari's information. Yes, Asgari is a more credible source than Alwan, but it still creates doubt.