A preliminary investigation indicated it tested positive for ricin, a poison found naturally in castor beans, the official said. Mail addressed to the White House is prescreened and tested for unsafe substances at an off-site mail facility.
Ricin is a highly toxic compound extracted from castor beans that has been used in terror plots. When made in a powder form, it is among the most deadly poisons. The matter is being investigated by the US Secret Service and the Federal Bureau of Investigation.
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A Navy veteran was arrested in 2018 and confessed to sending envelopes to Trump and members of his administration that contained the substance from which ricin is derived. CNN reported that the package of deadly poison was intercepted at a mail facility earlier this week. The castor powder he sent was not in its unsafe form.
According to the report, which was sourced from a law enforcement official who had been briefed on the matter, investigators believe the parcels were originally sent from Canada. Actress Shannon Guess Richardson was convicted in 2014 of sending ricin-containing letters to President Barack Obama and then-New York Mayor Michael Bloomberg.