After U.S. weapons inspector Charles Deulfer reported to Congress this week that he found no evidence Iraq had tried to rebuild an illicit weapons program following the 1991 Gulf War, CISAC Science Program Director Dean Wilkening said it's unlikely that inspections could have missed nuclear or chemical weapons or ballistic missile programs. However, biological weapons are the most difficult to detect and remain a significant security concern, he said.

Wilkening was interviewed by John Fowler of San Francisco's KTVU Fox 2 News, in a report on the findings of Deulfer's 17-month inspections for possible weapons of mass destruction in Iraq.