It would be too late as far as disarming Saddam is concerned. It would prove the assertion, but no one would care by that time.
If Saddam wants such weapons, the kinds of weapons that saved him from being overrun by Iran, that saved him from being overrun by Kurdish mothers and schoolchildren, that save him from being overrun by primitive, illiterate, swamp-dwellers from the south, there is no way to keep such weapons from him aside from invasion. The UN can debate the issue after the Coalition has taken care of the problem.