Ricin suspect denies poisoning plot

• Story Highlights
• Suspect had vague plot to poison people who angered him, prosecutors allege
  
• Suspect charged with possession of biological toxin, two weapons offenses
  
• "I didn't use that stuff because I couldn't," Roger Bergendorff tells judge
  
• Bergendorff was hospitalized, but no ricin found in his body
  
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