39 USC 3205: Accounting for penalty covers
Text contains those laws in effect on January 15, 2013
From Title 39-POSTAL SERVICEPART IV-MAIL MATTERCHAPTER 32-PENALTY AND FRANKED MAIL
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§3205. Accounting for penalty covers
Executive departments and agencies, independent establishments of the Government of the United States, and organizations and persons authorized by law to use penalty mail, shall account for all penalty covers through the Postal Service.