(a) A witness who appears before a magistrate and is sworn is subject to the penalties for perjury provided by law.(b) A referring court may issue attachment against and may fine or imprison a witness whose failure to appear after being summoned or whose refusal to answer questions has been certified to the court.Tex. Gov't. Code § 54.310
Acts 1985, 69th Leg., ch. 480, Sec. 1, eff. 9/1/1985.