To amend title 39, United States Code, to grant the United States Postal Service the authority to issue civil investigative demands, and for other purposes.

Authorizes the Postmaster General, whenever there is reason to believe that any person may be in possession, custody, or control of any documentary material or may have information relevant to an investigation of a matter arising under Federal postal law, to issue in writing and cause to be served upon such person before the commencement of a civil or criminal proceeding thereon, a civil...