Texas Statutes
Chapter 162 - Regulating Participation in Party Affairs
Section 162.013. Void Vote

Sec. 162.013. VOID VOTE. A vote in a primary election is void if the voter previously voted in a primary election of another party or participated in a convention of another party during the same voting year.
Acts 1985, 69th Leg., ch. 211, Sec. 1, eff. Jan. 1, 1986.