Tex. Election Code § 162.004

Sec. 162.004. AFFILIATION PROCEDURE: VOTING AT POLLING PLACE. (a) The signature roster for a primary election must state at the top of each page: "A person commits a criminal offense if the person knowingly votes in a primary election or participates in a convention of a party after having voted in a primary election or participated in a convention of another party during the same voting year."

(a-1) An election officer shall stamp a voter registration certificate with a party affiliation under Subsection (b) or provide an affiliation certificate under Subsection (c) unless, not later than the 90th day before the date of the primary election, the county chair notifies the county clerk that the chair does not require a stamped voter registration certificate or affiliation certificate for verification of attendance at a precinct convention.

(b) Subject to Subsection (a-1), an election officer at a primary election polling place shall stamp the party's name in the party affiliation space of the registration certificate of each voter who presents the voter's registration certificate and is accepted to vote unless the party name has already been stamped in the space.

(c) Subject to Subsection (a-1), if a voter is accepted to vote without presenting a registration certificate, the presiding judge shall issue the voter an affiliation certificate. The certificate is not required to be issued to a voter in a runoff primary unless the voter requests it. The affiliation certificate may be combined with the notice provided under Section 172.1114. If the combined form is used, an election officer is not required to comply with Subsection (b).