Early Users Of WMD....

The delivery methods were somewhat cruder then but had the desired effects.

Since 1346, when the Mongols catapulted corpses contaminated with plague over the walls into Kaffa (Crimea) and forced the besieged Genoans to flee, there have been many documented cases of the use of biological agents against people.

and I just read about this one...

In 1993, Iran reportedly plotted to contaminate water supplies in the United States and Europe with an unspecified biological agent, and Israeli Arabs plotted to poison the water in Galilee with an "unidentified powder."

Iran with nuclear weapons and the capacity to deliver them with intercontinental missiles is worrisome to me but not so to some, such as the IAEA. Iran is probably figuring that by playing the spineless Europeans against the Americans, they can buy huge amounts of time by continuing to negotiate and developing the weapons. When finally they do have a couple in their arsenal, they can then play their cards differently.