Lets see.... we invaded Iraq in part because they wouldn't let the UN inspect for weapon's of mass destruction ...

Today as reported in the Washington Post: "In a significant shift in U.S. policy, the Bush administration announced this week that it will oppose provisions for inspections and verification as part of an international treaty that would ban production of nuclear weapons materials.For several years the United States and other nations have pursued the treaty, which would ban new production by any state of highly enriched uranium and plutonium for weapons. At an arms-control meeting this week in Geneva, the Bush administration told other nations it still supported a treaty, but not verification.

<> Administration officials, who have showed skepticism in the past about the effectiveness of international weapons inspections, said they made the decision after concluding that such a system would cost too much, would require overly intrusive inspections and would not guarantee compliance with the treaty. They declined, however, to explain in detail how they believed U.S. security would be harmed by creating a plan to monitor the treaty

While declaring nonproliferation a priority, however, the administration has opposed other arms-control treaties that rely on inspection regimes.

In 2001, the administration opposed attempts to create an inspections regime for the Biological Weapons Convention. It has signed an arms-reduction deal with Russia that doesn't include new verification mechanisms, and in its first year in office, the administration pulled out of the Anti-Ballistic Missile Treaty."