How can I be sure there isn't one chemical/atomic/germ weapon in your garage, clivex? You display all the right-wing leanings of the classic mountain militia man. Who's to say you haven't cooked-up some nooks in your still? 
There can never be absolute certainty. Anyone who suggests as much, hasn't looked at a map, because Iraq is a fair bit bigger than your garage, and there's lots of crannies to hid nooks in.
However, with weapons inspectors there, and (albeit late) Iraqi co-operation manifesting itself in 2001, the lid was on the problem.
Indeed, in 2003, Saddam issued a Presidential decree prohibiting development of WMD. Not worth the paper it was written on? Perhaps, but I mention it, just to mention it.
Saddam had no motive to use WMD. He had no capacity to launch them, even if he had a motive.
As far as could reasonably be ascertained at the time, and with a reasonably high degree of certainty (given that the UN team were eventually given unrestricted and unannounced access to any site they thought interesting, after 2001), Iraq did not have a WMD capability prior to the Iraq War.
Personally, I'd rather that we had kept those UN inspectors in there for years to come, carrying out their 'tedious' task of ensuring a WMD capability could not be developed, than simply make shit-up in order that we could go to war with a country that was on its knees anyway.
