There were many sources of intel. The NY Times author could at least have done a LITTLE research here. Or maybe he did and the editor edited it all out :
From the State Dept web site:
"Although Iraq's mobile production program began in the mid-1990s, UN inspectors at the time only had vague hints of such programs. Confirmation came later, in the year 2000. The source was an eyewitness, an Iraqi chemical engineer who supervised one of these facilities. He actually was present during biological agent production runs. He was also at the site when an accident occurred in 1998. 12 technicians died from exposure to biological agents.
He reported that when UNSCOM was in country and inspecting, the biological weapons agent production always began on Thursdays at midnight, because Iraq thought UNSCOM would not inspect on the Muslim holy day, Thursday night through Friday.
He added that this was important because the units could not be broken down in the middle of a production run, which had to be completed by Friday evening before the inspectors might arrive again.
This defector is currently hiding in another country with the certain knowledge that Saddam Hussein will kill him if he finds him. His eyewitness account of these mobile production facilities has been corroborated by other sources.
A second source. An Iraqi civil engineer in a position to know the details of the program confirmed the existence of transportable facilities moving on trailers.
A third source, also in a position to know, reported in summer, 2002, that Iraq had manufactured mobile production systems mounted on road-trailer units and on rail cars.
Finally, a fourth source. An Iraqi major who defected confirmed that Iraq has mobile biological research laboratories in addition to the production facilities I mentioned earlier.
...snip...
- source : "Iraq's bioweapons program: detailed info on mobile labs from pre-war intel," US State Dept., Feb. 7, 2003
Richard W.