Word of the search in Texas comes a day after the FBI said its agents were looking for a letter sent to the CIA that they believe is similar to other letters , mailed from Spokane , Washington , that contained the deadly toxin . Ricin was found on letters sent to president , New York mayor , gun control group . In a separate incident , ricin is also found on letter to military base . Comment:
Ricin was found on letters sent to president , New York mayor , gun control group . In a separate incident , ricin is also found on letter to military base . Comment: