Finding both men not guilty of all charges Senior District Judge Howard Riddle said PC Hughes' language had been "unacceptable and offensive" but did not amount to a crime.

BBC: PC David Hair (left) and PC Kevin Hughes

Senior U.S. District Judge David Briones, a 17-year judicial veteran, had noticed the pattern in the cases.

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Last week, FBI agents arrested Matthew Ryan Buquet after a grand jury charged him with mailing threatening communication to a senior judge in the U.S. District Court for the Eastern District of Washington state.

CNN: Threatening letters to Bloomberg test positive for ricin