A letter that may have contained ricin or another poison was sent to the office of Sen. Roger Wicker of Mississippi.
CBS News reported that the letter preliminarily tested positive for ricin poison, but that further testing is required. CBS News has also learned that results from the more definitive test to be taken at the Baltimore FBI office will not be available until Wednesday.
A source told CBS News that an initial test on the letter returned a “slight positive” while two other tests were negative for radiological or biohazard material. A source said it’s common for false positives to come back on field tests of ricin, CBS News reported.
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