42 U.S. Code § 4156 - Waiver and modification of standards
1976—Pub. L. 94–541, in introductory text, inserted reference to the United States Postal Service with respect to standards issued under section 4154a of this title and struck out “is authorized” at end; in par. (1), inserted introductory words “is authorized”; and in par. (2), substituted “shall establish a system of continuing surveys and investigations” for “to conduct such surveys and investigations as he deems necessary”.