Texas Government Code - GOV'T § 393.103. Unauthorized Vote

(a) A delegate or alternate delegate may not cast an unauthorized vote.

(b) Except as provided by Section 393.104, the determination that a vote is an unauthorized vote may only be made by the house that appointed the delegate or alternate delegate who cast the vote.

(c) A vote determined to be an unauthorized vote is invalid.

(d) A delegate or alternate delegate who casts a vote determined to be an unauthorized vote is disqualified to continue to serve as a delegate or alternate delegate.  A vacancy in the office of a delegate or alternate delegate created by the disqualification of the delegate or alternate delegate shall be filled in the manner provided by Section 393.052.

(e) The presiding officer of the house that determined that a delegate or alternate delegate has cast an unauthorized vote shall promptly notify the head of the state delegation and the presiding officer of the Article V convention that the delegate or alternate delegate has cast an unauthorized vote and is disqualified to serve as a delegate or alternate delegate.