From a BBC Panorama story:
But not all the intelligence was wrong. Information from two highly-placed sources close to Saddam Hussein was correct.
Both said Iraq did not have any active WMD.
Ex-CIA man Bill Murray was not happy with the way the intelligence from these two highly-placed sources had been used.
“I thought we’d produced probably the best intelligence that anybody produced in the pre-war period, all of which came out – in the long run – to be accurate. The information was discarded and not used.”
It wasn’t used because it wasn’t politically convenient to an administration hellbent on war.