憲法第一條第四款說的是州負責製定manner,就包括了如何核對選民身份。國會有權通過立法修改，但行政部門無此權力。

The Times, Places and Manner of holding Elections for Senators and Representatives, shall be prescribed in each State by the Legislature thereof; but the Congress may at any time by Law make or alter such Regulations, except as to the Places of chusing Senators.