I guarantee for you that they were not supposed to have even one ounce of VX agent or Nerve agent, or Mustard Gas.
I know that many will say "SO What?" show us the Chemical Weapon stocks and then we believe that Saddam has WMD. This is a weak argument because as I said before whenever they had the opportunity to produce it on mass scale they will do so. We toppled Saddam Regime not because of his stocks of WMD but because of his great danger to the region and in a world after 9/11 you cannot allow such a man to stay in power because even if he did not have large quantify of WMD, he will produce them and use them on a large scale when the opportune time will come.
If you know Arabic and read the many documents and hundred of pages about AL Qadisya Air base, will be shocked with their obsession with the Chemical Platoons, Chemical Classifications, Chemical training etc... Almost everything in these air bases revolve around the Chemical programs.
Chemical weapons are different from bios in that regard. With bio weapons, you grow new cultures from the old, so maintaining even a small stockpile has to be prohibited. But with chems, you just manufacture them without needing a starter. The tiny amounts used for detection and testing aren't of any use on the battlefield.