39 tons of it. Shown this evidence by UNSCOM, Taha admitted to the inspectors that she had grown 19,000 litres of  botulism  toxin; 8,000 litres of  anthrax ; 2,000 litres of  aflatoxins , which causes liver failure;  Clostridium perfringens , a bacterium that causes gas  gangrene ; and  ricin , a castor-bean