5 U.S. Code § 5741
5.U.S. Code § 5741 is about General prohibition. It is under Subchapter III (Transportation Of Remains, Dependents, And Effects) of Chapter 57 (Travel, Transportation, And Subsistence) of Subpart D (Pay and Allowances) of Part III (Employees) of Title 5 (Government Organizations and Employees) of the Code.
Except as specifically authorized by statute, the head of an Executive department or military department may not authorize an expenditure in connection with the transportation of remains of a deceased employee.