Some sources for you:
http://www.dni.gov/press_releases/20071203_release.pdfThis is the 2007 NIE on Iran's nuclear weapons program and intentions. As you know from your experience in the US Intelligence Community an NIE represents the consensus view of all 16 IC member agencies on a specific warning problem. In 2007 all 16 agencies (including CIA and DIA) signed off on this NIE. Read the Key Judgments page for the main points of the estimate. While NIEs are produced 'on request,' in my experience if intelligence comes to light that markedly changes the judgment of the current NIE, the IC will often initiate an update to the NIE to publish the new judgments. No such update or new NIE has been produced, but...
http://wonkroom.thinkprogress.org/2010/01/17/new-iran-nie-coming-soon/Rumor has it that a new NIE may be in the works as of Jan 2010, but in this article the author cites a Jan 2010 interview with the Director of DIA wherein he says DIA's position is that the 2007 NIE is still valid. Perhaps this Iranian scientist has in fact revealed new information that overturns the 2007 NIE, and that's where the rumor of a new NIE originates, but in that hypothetical case the Dir DIA is either unconvinced by the new intelligence or not privy to it (the former would be far more likely).
http://www.politico.com/blogs/laurarozen/0310/Iran_NIE_update_delayed.htmlSubsequent article that the new NIE has been delayed. A delay most likely indicates either that a sudden controversy over the available intelligence has thrown the IC into conflict over the tone of the new NIE, or that the IC members have judged there is not enough of a change from the 2007 NIE to warrant a new NIE. These are not the only explanations, but in my experience the two most probable. The statement by Dir DIA would tend to indicate the latter.
http://www.iaea.org/Publications/Documents/Board/2010/gov2010-10.pdfMost current IAEA report on Iran's nuclear infrastructure. Sections E and F are most instructive. F says "While the Agency continues to verify the non-diversion of declared nuclear material in Iran, Iran has not provided the necessary cooperation to permit the Agency to confirm that all nuclear material in Iran is in peaceful activities." Out of the organizations we've discussed here, that's about the most pessimistic statement on Iran's possible weapons program that I can find.
You wrote: "Iran has NO nuclear weapons program?" That is the current judgment of the 16 members of the IC, re-stated in Jan 2010 by Dir DIA. It is also the direction IAEA is tending, although they are even more conservative in their wording than the IC.
You wrote: "As I understand it, an Intelligence Assessment gives "the weight" of the prevailing data." I would direct you to the introduction to the 2007 NIE. Phrases such as "high confidence" have very specific meanings. When using that phrase, "the weight" is pretty darned heavy.
You wrote: "Such data sets can be massaged, altered and/or tweaked at any time to support an entirely different conclusion." Then by extension it's not too hyperbolic to say that facts don't really exist at all since there is no ultimate assurance of the accuracy of anything. Sure, any data can be faked or altered, but all 16 agencies have to agree to the deception such that none spoil it by throwing a "dissenting opinion" into the NIE. And bear in mind not all IC agencies are Department of Defense. Besides CIA, Energy and State are also full members, and on nuclear issues Energy carries a lot of weight and has a lot of credibility at stake. Obviously this did not prevent politicization of the Iraq NIE in 2002/3, but if you read the current NIE it seems pretty clear they know they got burned and aim to prevent it happening again. Out of a sense of self-preservation if nothing else.
You stated: "I know better than to TRUST information that can not be traced to multiple and varied sources." Of course; that's intelligence analysis 101. But the problem here is you will never be given access to the multiple and varied (intelligence) sources involved, so by your own statement you can never trust anything. But if you mean open sources, then you already have multiple and varied sources (NIE, Dir DIA statement, parallel IAEA reports for example) that point to the same conclusion: based on the best evidence available in 2007 and up to the present, at least 17 agencies (IC + IAEA) do not believe or have little indication that an Iranian nuclear weapons program exists.
Please note the by "weapons program" we're talking a production program aimed at producing a useable nuclear weapon. There is some evidence that Iran is doing research on various technologies that are applicable to (sometimes ONLY applicable to) a weapons production program. But capability to do something does not automatically, or even predominately, equate to intent to do something. For example Japan has more than enough nuclear expertise and infrastructure to produce a nuclear weapon in pretty short order. They just have zero intent to do so.
By the way you have a disconcerting tendency to throw quotes around words I never used, like "a firm stand." I select my words carefully and I would appreciate it if, especially given your academic background, you would refrain from placing quotes around things I didn't write as is standard academic practice. Yes, I said very similar things, but I never used those exact words, and therefore quotes (either "" or **) are akin to putting words in others' mouths. Thank you in advance for your consideration.