It's good information about the mustard gas, but maybe not so good about Sarin. I went to the wrong page of the report. At the bottom of page 72 (74 of the PDF document), here's what it says about the Sarin that was produced in the 1980s:
According to documents discovered by UNSCOM in Iraq, the purity of Sarin-type agents produced by Iraq were on average below 60%, and dropped below Iraq’s established quality control acceptance level of 40% by purity some 3 to 12 months after production.
According to the next page of the report, UNSCOM couldn't determine whether Iraq had produced large quantities of Sarin after they switched to binary production of Sarin in 1988. This would have preserved the product at high purity until it was ready to use. It will be interesting to hear the details of what kinds of WMD have been found and whether the Sarin components are in binary form. Prudence would dictate that we assume all the Sarin we find is in binary form and at full potency until determined otherwise.
If it is in binary form, it isn't sarin yet.