An envelope mailed to the White House tested positive for cyanide, the Secret Service said. The envelope arrived on Monday at a facility elsewhere in the Washington area that screens mail for the White House. Biological tests were negative, but a chemical test on Tuesday came back positive for cyanide, the agency said. The envelope was sent to another facility to confirm the result. According to the website The Intercept, a law enforcement alert said that the return address was for a man who has a Secret Service record dating to 1995, including sending a package covered in urine and feces. Read more http://www.nbcnews.com/news/us-news...-positive-cyanide-secret-service-says-n325566
