Before the surgery , he submitted blood samples to Johnson County 's crime lab to be tested for ricin antibodies .
Farrar underwent surgery in November 1995 to treat an aneurism that his doctors believed had been caused by the poisoning .
Before the surgery , Farrar submitted blood samples to Johnson County 's crime lab to be tested for ricin antibodies .
Farrar underwent surgery in November 1995 to treat an aneurism that his doctors believed had been caused by the poisoning .