 While in the hospital for treatment , Green was diagnosed with " major bipolar depression with suicidal impulses " and placed on Prozac , <unk> , and <unk> . She returned home after four days in the hospital . Farrar , who had researched castor beans in the interim and came to the conclusion that Green had poisoned his food with the ricin that could be derived from the beans , moved out immediately upon Green 's return home . 
