The judge may have been "sure it was in the bomb," but the defendants were never even charged under anti-terrorism statutes that make mere possession of potential chemical and biological weapons a federal crime, Parachini noted. The rumor's origins date back to an earlier raid by the FBI of a New Jersey storage shed rented by the suspects. The agents found one sealed bottle of sodium cyanide in aqueous form. Aqueous sodium cyanide is used for photographic purposes and can cost less than $3 per pound, Parachini noted in his study, after consulting chemical experts. But it is sodium cyanide in solid form, usually briquettes costing many hundreds of dollars more, that can be effective as a chemical weapon when it's converted to hydrogen cyanide gas by a blast.
Nevertheless, the federal prosecutor in the initial World Trade Center trial raised the idea of a chemical bomb when questioning a senior FBI official, Steven Burmeister, about the consequences of mixing sodium cyanide with other chemicals present in the bomb. Burmeister testified that "if you breathe that gas I'm afraid you've breathed your last breath." Despite this "chilling testimony," however, "Burmeister never suggested during the trial that his investigation had led him to believe that the bomb actually contained sodium cyanide," Parachini writes -- and the trial transcript proves.
In addition, an FBI chemist who participated in the case told Parachini flatly, "There is no forensic evidence indicating the presence of sodium cyanide at the bomb site." Salon