article_snippet: An envelope sent to the White House earlier this week has tested positive for cyanide and further tests will be carried out to confirm the finding, the Secret Service has said.
article_snippet: Though initial biological testing yielded negative results, chemical testing returned 'presumptive positive' for cyanide on Tuesday, CNN reported.
article_snippet: : An envelope sent to the White House earlier this week has tested positive for cyanide, the Secret Service said Tuesday, and a third round of tests to confirm the finding will now be carried out . '
highlights_snippet: An envelope sent to the White House earlier this week has tested positive for cyanide and further tests will be carried out to confirm the finding .
  