The White House this week was sent a letter that tested positive for cyanide, US media reported Tuesday, in yet another piece of bad news for the Secret Service.
"On Monday 3/16/15, an envelope was received at the White House Mail Screening Facility. Initial Biological testing was negative; however, on 03/17/15, the chemical testing returned a presumptive positive for cyanide," Secret Service spokesman Brian Leary said in a statement on CNN. "The sample was transported to another facility to confirm the results."