Envelope mailed to White House tests 'presumptive positive' for cyanide

An envelope mailed to the White House tested "presumptive positive" for cyanide and will undergo more testing to confirm the results, the U.S. Secret Service said on Tuesday. The agency charged with protecting the president said the envelope, which was received on Monday at the White House Mail Screening Facility, initially tested negative. Biological testing on Tuesday "returned a presumptive positive for Cyanide," the Secret Service said in a statement, adding the sample was then sent to anoth