even if Saddam had given the sarin cannisters to Al Qaeda in some weird suicide move, they would not have been able to use them to cause massive destruction. That is, in the final analysis, what makes a WMD a WMD - not some legalese definition, but the ability to cause massive destruction. That sarin was not capable of that. sorry.
Oh, I have already agreed, they were degraded and ineffective. I've also pointed out, unless Saddam was idiotically trying to make WMD's while the UNSCOM team was scouring the country, any Sarin bombs he had, were out-dated. They have a relatively short shelf-life.
In the final analysis, a Sarin bomb that was produced to be a WMD, is a WMD until it is destroyed, and then it's a destroyed WMD. The Army Field Manual has specific guidelines for handling these WMD's, they certainly do not consider them anything other than WMD's. There is no arbitrary point at which a WMD changes to something else, it's potency is directly related to the purity of the precursors, storage conditions, contamination elements, temprature and humidity, and how well they are sealed. So, there is really no way to tell if a WMD is capable of its full potential, and there is also no outward difference in apperance, between a conventional Sarin bomb, and a 'binary' Sarin bomb. Keep in mind, the binary process Saddam's scientists pioneered, greatly extends the normal shelf-life, by keeping the super-pure precursors separated until detonation.
When we use the term "weapon of mass destruction" it has several meanings. The layman's meaning is the one you wish to apply, it must be a weapon capable of creating mass destruction. However, a weapon is an inanimate object, it is not capable of anything on its own. This brings in the CWC, a convention formed by the UN to determine what exactly constitutes a "WMD". They are fairly clear about it, Sarin bombs, regardless of their age or potency, are considered WMD's.
The issue of potency is not part of the debate here. Saddam had told the UN inspectors, he destroyed these Sarin bombs. That is the issue. He lied. We will probably never know what all he lied to us about, or whether he had a viable WMD program at the time Bush gave his Axis speech, but we do know one thing for certain now... Saddam doesn't have WMD's! He's not a threat anymore! We no longer have to be uncertain, we no longer have to rely on intelligence information, we have changed our doubts into absolute certainty.