This American perspective blog asks the question "what evidence is there of an Iranian nuclear bomb programme."
The answer, backed up by the latest US intelligence reports, seems to be that any related research or work ended in 2003, and that Iran does not have a weapons development programme.
Some fascinating detail on the US efforts (fake bricks and road signs, sensitive to radioactivity) that have failed to come up with any evidence that Iran is working towards a bomb.
I'm posting this in the context of the current punitive sanctions to be imposed on Iranian oil exports, that are so severe that they could be considered an act of war by the US and EU against Iran.
For decades Americans have been subjected to saturation bombing by misinformation and outright lies about Iran. The information from our intelligence agencies has painted a more accurate picture, if we choose to see it