They were able to search in very late 2002 and early 2003. From late summer 2002, the Bush Adminstration was in full “gonna attack Iraq” mode.
The writing on the wall does not get any more clear. It was in Saddam’s interest to cooperate as fully as possible just before the dawn of an invasion.
Weren’t intelligence photos shown during Powell’s UN presentation showing trucks leaving from the rear of sites as UN vehicles approached from the front? Access was eventually granted, but only after the bad guys were able to get out of Dodge. Or was this from past inspections?