3 GCA § 15402: Manner of Voting.

Any person desiring to vote at a primary shall state his or her full name and address to the election officials, and shall present a validly issued photo identification card issued by a federal, state, Guam secondary school, Guam post-secondary school or Government of Guam entity to the precinct official or other authorized election official. If the person desiring to vote is not challenged, a precinct clerk shall issue to him or her only one (1) official primary ballot. The voter shall proceed to enter one (1) of the compartments provided and therein mark the ballot. The marked ballot shall immediately be placed in the ballot box provided. In addition, the provisions of Chapter 10 of this Title (Absent Voting) shall also apply to a primary election so as to permit voting by absentee ballot therein.