Colin Powell admitted just the other day that
it's unlikely that we'll ever find any WMD's in Iraq. Even after he guaranteed that they existed and were plentiful in his arguments for the invasion of the country back in early 2003. I'm sure there's a possibility that they were destroyed, or shipped out of the country, but with everything that has been said by UN weapons inspectors in the past, if they were ever there, I doubt they were as plentiful and useful as we were led to believe.