So that gave Dubyah and Tony quite a bit of leeway for invading Iraq, right?
Yes! Or, no! That definition of WMD only applies to the criminal justice system (US Title 18), introduced in response to the 1993 WTC bombing. US laws dealing with War and National Defense define WMD more conventionally.
Having said that, now there are reports that the Sydney plotters intended to release poison gases, which would qualify under most WMD definitions.
Australian terror plot ‘involved gas attack on plane’