Iraq sarin shell is not part of a secret cache

Many things go wrong when firing an artillery round: the propellent charge can be faulty, resulting in a round that doesn't reach its target; the fuse can malfunction, preventing the burster charge from going off, leaving the round intact; the rupture disk can fail to burst, keeping precursor chemicals from combining. The fuse could break off on impact, leaving the fuse cavity empty. To the untrained eye, the artillery shell, if found in this state, would look weathered, but unfired.

What gives away whether the shell had been fired is the base-bleed charge, which unlike the rest of the shell, will show evidence of being fired (or not). Iraq declared that it had produced 170 of these base-bleed sarin artillery shells as part of a research and development program that never led to production. Ten of these shells were tested using inert fill - oil and colored water. Ten others were tested in simulated firing using the sarin precursors. And 150 of these shells, filled with sarin precursors, were live-fired at an artillery range south of Baghdad. A 10 percent dud rate among artillery shells isn't unheard of - and even greater percentages can occur. So there's a good possibility that at least 15 of these sarin artillery shells failed and lie forgotten in the Iraq desert, waiting to be picked up by any unsuspecting insurgent looking for raw material from which to construct an IED.

Given what's known about sarin shells, the US could be expected to offer a careful recital of the data with news of the shell. But facts that should have accompanied the story - the type of shell, its condition, whether it had been fired previously, and the age and viability of the sarin and precursor chemicals - were absent. And that's opened the door to irresponsible speculation that the shell was part of a live WMD stockpile. The data - available to the ISG - would put this development in proper perspective - allowing responsible discussion of the event and its possible ramifications.

Given that the US is in the midst of a contentious presidential campaign, it's essential that accurate data about Iraq be available to the electorate. The handling of the sarin shell incident is the greatest justification yet for shutting down the ISG, and the immediate return to Iraq of UN weapons inspectors - if for no other reason than to restore a vestige of credibility to a disarmament effort that long ago lost its moral compass.

• Scott Ritter was a UN weapons inspector in Iraq (1991-1998) and is author of 'Frontier Justice: Weapons of Mass Destruction and the Bushwhacking of America.'

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