( CNN ) -- A man believed to have been exposed to the deadly poison ricin in a hotel room in Las Vegas , Nevada , is out of his coma and is being questioned by authorities , FBI Special Agent David Staretz said Friday . Ricin , guns and an `` anarchist-type textbook '' were found in a room in this Las Vegas hotel , police say . Staretz would not comment further on Roger Bergendorff , 57 , who authorities said was taken to a hospital February 14 after complaining of breathing difficulties . He is listed in critical condition , said Naomi Jones , spokeswoman for Spring Valley Hospital Medical Center in Las Vegas . Bergendorff , an artist who neighbors said had lived in his cousin 's basement before moving to Las Vegas , was exposed to the poison in a Las Vegas extended-stay hotel , a law enforcement official said . The Riverton , Utah , home where Bergendorff previously lived belongs to Thomas Tholen , who along with his wife and daughter tested negative for ricin , according to authorities . That home and three storage areas in nearby West Jordan , Utah , were searched for ricin earlier this month and declared safe by authorities . A relative who went to Bergendorff 's hotel room after he was sent to the hospital found the substance and alerted police February 27 . Ricin is a poison that can be made from waste left over after processing castor beans , according to the Centers for Disease Control and Prevention . It can come in the form of a mist or pellet and can be dissolved in water or weak acid , the agency said . E-mail to a friend .
Roger Bergendorff thought exposed to ricin in Nevada hotel room . Bergendorff , in coma since February , awake and being questioned . Score: 7