DG:
Prior to the March 2003 U.S.-led invasion of Iraq, the UN Security Council adopted Resolution 1441 in November 2002 giving Iraq a “final opportunity” to comply with its disarmament requirements under previous Security Council resolutions. At issue was Iraq’s failure to provide an adequate accounting of its prohibited weapons programs or to convince UN inspectors that its weapons of mass destruction had been destroyed as Baghdad claimed.
UN weapons inspectors worked in Iraq from November 27, 2002 until March 18, 2003. During that time, inspectors from the International Atomic Energy Agency (IAEA) and the United Nations Monitoring, Verification, and Inspections Commission (UNMOVIC) conducted more than 900 inspections at more than 500 sites. The inspectors did not find that Iraq possessed chemical or biological weapons or that it had reconstituted its nuclear weapons program.
Although Iraq was cooperative on what inspectors called “process”—allowing inspectors access to suspected weapons sites, for example—it was only marginally cooperative in answering the questions surrounding its weapons programs. Unable to resolve its differences with Security Council members who favored strengthening and continuing weapons inspections, the United States abandoned the inspections process and initiated the invasion of Iraq on March 19.
http://www.armscontrol.org/factsheets/iraqchron