AGHDAD, Iraq, April 26 — Nissar Hindawi, a leading figure in Iraq's biological warfare program in the 1980's, says the stories and explanations he and other scientists told the United Nations about the extent of Iraq's efforts to produce poisons and germ weapons "were all lies."Dr. Hindawi, imprisoned during the final weeks of Saddam Hussein's rule, is now free to talk about his experiences in the program, in which he says he was forced to work from 1986 to 1989 and again sporadically until the mid-1990's. Iraq, as it belatedly acknowledged, he says, "produced huge quantities" of liquid anthrax and...