They are from the first gulf war
Which means they were about 13 years old when we invaded Iraq. Pre-mixed sarin has a shelf life of weeks or month. In binary form only a couple of years. I'm certainly not defending Saddam, but the WMDs we were looking for should have been weapons grade. The more important story, which the press chooses to ignore is how much equipment Saddam had in storage which would have allowed him to build up his arsenal of chemical weapons in short order. It doesn't matter if you have chemical weapons, what matters is ability and intent.
The above story alone substantiates the reasons for going into Iraq.
They are from the first gulf war
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so what. They're still WMD's.