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Uniformed Secret Service agents patrol the top of the White House as seen from the South Lawn of the White House in Washington, Tuesday, March 17, 2015. According to the Secret Service a letter sent to the White House tentatively tested positive for cyanide. The letter was received at an off-site mail screening facility on March 16 and additional testing Tuesday returned a "presumptive positive" for cyanide. (AP Photo/Jacquelyn Martin)

Uniformed Secret Service agents patrol the top of the White House as seen from the South Lawn of the White House in Washington, Tuesday, March 17, 2015. According to the Secret Service a letter sent to the White House tentatively tested positive for cyanide. The letter was received at an off-site mail screening facility on March 16 and additional testing Tuesday returned a "presumptive positive" for cyanide. (AP Photo/Jacquelyn Martin)

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