] So, where did this sarin come from? Where was it made, *when*
] was it made, and where has it been stored? And, most
] importantly, is this just the tip of the iceberg? Are these
] just a couple stray shells left around for years, or is there
] more? And if so, where?

A possible explaination is this is an OLD WMD. I have never said that IRaqi didn't have WMDs, indeed we gave them to Iraq. Chemical and Biological weapons breakdown over time, and (as I struggle to find the link to more info on this), weapons manufactured before sometime like 1995 have degraded to non-weaponizable forms.

This could be why the chemicals failed to mix or react.

Of course it could be some other reason.

RE: Tests Confirm Sarin in Iraqi Artillery Shell