From what I understand Adam Smith was outside the stadium and was recruited by LEOs to help divert the crowd away from the crime scene. The part about "as he was leaving" isn't correct according to the taped interview I saw with Smith initially. (I think it was on Ch. 9, but not sure...).
The Ammonium Nitrate attempt to purchase was confirmed by OUPD and the owner of Ellison Feed & Seed (I think that's the name of the store). You can check out my summary, and links listing on my blog for more details as I don't have the time right this moment to retrieve it all. (sorry!) (o:
The clarification also leads to questions. (Don't they always? :^( )
It is difficult to believe that LEO would just draft a stranger into assisting them in their duties.
After the "Hundreds of Bodies in Trees" article posted here after Katrina I have become very skeptical over unsupported statements about events. Before that I was a sweet, innocent, gullible, dewy-eyed believer.