Senator Rick Santorum

"We now have found stockpiles," Santorum asserted.

But intelligence officials, who spoke on condition of anonymity because of the subject's sensitive nature, said the weapons were produced before the 1991 Gulf War and there is no evidence to date of chemical munitions manufactured since then. They said an assessment of the weapons concluded they are so degraded that they couldn't now be used as designed.

They probably would have been intended for chemical attacks during the Iran-Iraq War, said David Kay, who headed the U.S. weapons-hunting team in Iraq from 2003 until early 2004. He said experts on Iraq's chemical weapons are in "almost 100 percent agreement" that sarin nerve agent produced from the 1980s would no longer be dangerous.

"It is less toxic than most things that Americans have under their kitchen sink at this point," Kay said. And any of Iraq's 1980s-era mustard would produce burns, but it is unlikely to be lethal, Kay said.