Texas Government Code - GOV'T § 33.026. Witness Immunity

(a) In a proceeding or deposition related to a proceeding before the commission, a special master, or a special court of review, the commission, special master, or special court of review may compel a person other than the judge to testify or produce evidence over the person's claim of privilege against self-incrimination.

(b) A person compelled to testify over a proper claim of privilege against self-incrimination is not subject to indictment or prosecution for a matter or transaction about which the person truthfully testifies or produces evidence.

(c) A special master has the same powers as a district judge in matters of contempt and granting immunity.