Politico and CNN are reporting that the deadly poison ricin has been detected in Congressional mail:Politico:An envelope sent to an office of Sen. Roger Wicker (R-Miss.) included a substance that has tested positive for Ricin, two sources say. It was not immediately clear when the envelope was received or whether it was sent to his Washington, D.C., office or a field office.A breaking news email from CNN read:An envelope that tested positive for the deadly poison ricin was intercepted Tuesday afternoon at the U.S.