A letter sent to the White House on Monday actually contained saliva, after a test suggested that it might have contained cyanide, according to ABC News.
The White House said on Monday that it was sent a letter that contained a suspicious substance. The substance was tested and came back negative for toxins but a second round of tests suggested that the liquid could have been cyanide, spurring yet another round of testing.
The third round concluded that the substance contained a few trace amounts of cyanide, according to ABC News, but was mostly saliva.
ABC News said that the person who sent the letter is believed to be a homeless man in or around Chicago who smokes often which would produce the small amounts of cyanide.