Yes, I suppose we should have been able to surveil the entire span of Iraq's borders for 12 years as he moved and/or hid the weapons from the UN and allied forces.
Per the letter of the 1991 cease fire, Saddam had a specific period of time to disarm, and discard all WMD's, twelve years later, he failed to demonstrate that he had kept to the accords of the 1991 cease-fire for twelve consecutive years.
Tired of waiting around for Saddam to turn in the proper pa[perwork to the UN, we went in to take a look ourselves.
We're still doing it.
Saddam didn't like the notion of our coming to take a look-see, and ordered his troops to stop us. These troops have been rendered useless, and Saddam, exhibiting all the characteristics of a truly poor host, is nowhere to be seen.
Hope that helped.