39 U.S. Code § 601 - Letters carried out of the mail
2006—Subsecs. (b), (c). Pub. L. 109–435 added subsecs. (b) and (c) and struck out former subsec. (b) which read as follows: “The Postal Service may suspend the operation of any part of this section upon any mail route where the public interest requires the suspension.”
Section 7 of Pub. L. 91–375 required the Board of Governors of the United States Postal Service to make a study of the restrictions on the private carriage of letters and packets and to submit a report and recommendations for modernization to the President and to the Congress within 2 years after the effective date of this section.
Provisions of section 7 of Pub. L. 91–375 effective within 1 year after Aug. 12, 1970, on date established therefor by the Board of Governors and published by it in the Federal Register, see section 15(a) of Pub. L. 91–375, set out as an Effective Date note preceding section 101 of this title.