According to David Hendel writting for The Contractors Perspective:
Did the U.S. Postal Service’s lack of procurement regulations inadvertently help USPS officials carry out a $13 million bribery scheme over several years? Five Postal Service employees were indicted in May 2011 by a Detroit, MI grand jury for taking bribes and steering as much as $13 million in vehicle maintenance work to a private contractor. Could this scheme have been prevented, or caught earlier, if USPS had not abolished its procurement regulations in 2006?
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The alleged brides: Five Postal Supervisors Indicted For Taking Bribes