The substance believed to be contained in a letter sent to President Obama is likely ricin.
While usually lumped in with bioterror agents, Virginia Department of Health State Epidemiologist Dr. David Trump says anthrax poses the same threat. Both of them are dangerous to the person or people that are immediately exposed through inhaling a powder or consuming the substance. Neither are spread from person to person. Ricin is often more easily to come by. trump says it is derived from the bean of the castor plant, used to make castor oil.
Post 9-11, many mail centers away from lawmaker's offices are helping keep more people safe.