I’m trying to figger out what law was broken ? If the yellow cake was in Sierra Leone and the customer was Iran the US gov’t might not like the sale but couldn’t possibly make it illegal. An international embargo isn’t enough to get one in a US jail. Yellow cake is essentially yellow dirt and is less radioactive than a good watch. I can see the guy hiding his sample so some airport jerkopf doesn’t think his baggy is full of dirty coke but I don’t , so far, see this guy getting busted for anymore than general stupidity.
Followup:
http://www.reuters.com/article/2014/05/21/us-usa-florida-uranium-iran-idUSBREA4K01220140521