Very good question.
According to the perp the Jordanians captured:
Jordanian authorities said the attack would have mixed a combination of 71 lethal chemicals, which they said has never been done before, including blistering agents to cause third-degree burns, nerve gas and choking agents.More info here: http://www.cnn.com/2004/WORLD/meast/04/26/jordan.terror/
If it was the case that the chemicals found by the Jordanians was weapons grade material then it would have been breaking news via the Pentagon and especially the ISG. The Jordanians recovered vast quantities of off the shelf chemicals and pesticides, but not weapons grade nerve agents. Jordan would have given the US full access to the chemicals found for testing. Not one Pentagon report has come out that any of those chemicals found was weapons grade chemicals from battle field weapons. If it was the case then President Bush or Rumsfeld would have been broadcasting it to the world.